〜か知らない or 〜か不安だ


I came across the following sentence in an exercise:

> インターネットで注文したセーターは、実際に着てみるまでサイズが_____が、ちょうどよかった。

Although only B and D make sense to me, here are the four propositions:

> A. 合わなかった
>
> B. 合うかどうか知らなかった
>
> C. 合わないかもしれない
>
> D. 合うか不安だった

I picked B, but the solution was D. In both cases, I'd say the meaning is
along the lines of `until I actually wore it, I wasn't sure if it was going to
fit`. My reasoning was that while both B and D are semantically correct, `不安だ`
is rather strong, like I'm not gonna be anxious because I'm not sure if my
sweater will fit.

Do you agree with the solution, that `サイズが合うか不安だった` is the correct answer? If
so, is B correct as well, or does it make sense at all? Or am I right to think
that `不安` adds a nuance that's too strong for this context?

Additionnally, I'm perplexed by `インターネットで注文したセーター`. Is it alright to use
`注文する` when shopping online? I'm much more used to hearing and saying `注文` in
the context of a restaurant, but can it be used in other situations?




> 「インターネットで注文{ちゅうもん}したセーターは、実際{じっさい}に着{き}てみるまでサイズが_____が、ちょうどよかった。」
>
> A. 合{あ}わなかった
>
> B. 合うかどうか知{し}らなかった
>
> C. 合わないかもしれない
>
> D. 合うか不安{ふあん}だった

First of all, A and C are out of the question as neither one logically fits
the context.

From my personal experience with Japanese-learners, I know many of them would
think B was correct, but it is not. **B is "grammatical" if anything, but
contextually, that is not where native speakers would use the verb 「知る」 in the
first place**.

What is the other verb that means "to know" that you may have been wondering
why native speakers use so often? It is, of course, 「わかる」. If B had read
「合うかどうか **わからなかった** 」 instead of 「合うかどうか **知らなかった** 」, it would have been a
correct answer as well.

Regarding D, it is correct as is, making it the _only_ correct answer among
the four choices.

> "不安だ is rather strong, like I'm not gonna be anxious because I'm not sure if
> my sweater will fit."

It is not necessarily strong used all by itself for us native speakers. If you
added qualifiers such as 「とても」、「大変{たいへん}」, etc, it would certainly be strong.

Finally, 「注文」 is used to request and purchase all kinds of goods and services
both online and in real life. It is not only used in eateries.




> 「インターネットで注文{ちゅうもん}したセーターは、実際{じっさい}に着{き}てみるまでサイズが_____が、ちょうどよかった。」
>
> A. 合{あ}わなかった
>
> B. 合うかどうか知{し}らなかった
>
> C. 合わないかもしれない
>
> D. 合うか不安{ふあん}だった

First of all, A and C are out of the question as neither one logically fits
the context.

From my personal experience with Japanese-learners, I know many of them would
think B was correct, but it is not. **B is "grammatical" if anything, but
contextually, that is not where native speakers would use the verb 「知る」 in the
first place**.

What is the other verb that means "to know" that you may have been wondering
why native speakers use so often? It is, of course, 「わかる」. If B had read
「合うかどうか **わからなかった** 」 instead of 「合うかどうか **知らなかった** 」, it would have been a
correct answer as well.

Regarding D, it is correct as is, making it the _only_ correct answer among
the four choices.

> "不安だ is rather strong, like I'm not gonna be anxious because I'm not sure if
> my sweater will fit."

It is not necessarily strong used all by itself for us native speakers. If you
added qualifiers such as 「とても」、「大変{たいへん}」, etc, it would certainly be strong.

Finally, 「注文」 is used to request and purchase all kinds of goods and services
both online and in real life. It is not only used in eateries.

