"もを" is too unnatural, so use a comma instead of "も" in this list?


Can I re-write this sentence:

> このクレジットカードは国内、国外を問わず、いろいろな場所で使える。

as

> このクレジットカードは国内 **も** 国外 **もを** 問わず、使える。

A good reason to have replaced the first "も" with "、" is to avoid the
unfortunate, (but grammatically correct?), "もを" string of particles?




The correct sentence is:

> このクレジットカードは国内 **か** 国外 **か** を問わず使える。

This か is the question marker and forms [an embedded
question](https://japanese.stackexchange.com/a/13038/5010).

This should be straightforward because, in English, you should say "regardless
of whether it's A or B", not "regardless of both A and B".

Of course you can also say it without 問わず at all:

> このクレジットカードは国内 **でも** 国外 **でも** 使える。

But note that 国外でもを is ungrammatical because ～でも (="also in ～") is an
adverbial phrase which never serves as an object marked with を.




The correct sentence is:

> このクレジットカードは国内 **か** 国外 **か** を問わず使える。

This か is the question marker and forms [an embedded
question](https://japanese.stackexchange.com/a/13038/5010).

This should be straightforward because, in English, you should say "regardless
of whether it's A or B", not "regardless of both A and B".

Of course you can also say it without 問わず at all:

> このクレジットカードは国内 **でも** 国外 **でも** 使える。

But note that 国外でもを is ungrammatical because ～でも (="also in ～") is an
adverbial phrase which never serves as an object marked with を.

