Why "We've worked" can't be in the past?


On Duolingo with the phrase "We've worked at this bakery since twenty eleven."
It doesn't accept 私たちは２０１１年からこのパン屋で働いていました. It says the correct answer is
私たちは2011年からこのパン屋で働いています

Why can't I use 働いていました?




My understanding of the English _" we **have worked** at `[place]` since
`[time]`"_ is that it describes an ongoing period -- the speaker began working
there at `[time]`, and **still works there**. If the speaker no longer worked
there, I would expect them to say _" we **had worked** "_ or even just _" we
**worked** "_ instead.

Because the speaker **still works there** , the Japanese phrase 「働【はたら】いていました」
is incorrect, since that ～てい(まし)た phrasing puts the action firmly in the past,
as a completed event -- much like the English _" we **[had] worked** "_.




My understanding of the English _" we **have worked** at `[place]` since
`[time]`"_ is that it describes an ongoing period -- the speaker began working
there at `[time]`, and **still works there**. If the speaker no longer worked
there, I would expect them to say _" we **had worked** "_ or even just _" we
**worked** "_ instead.

Because the speaker **still works there** , the Japanese phrase 「働【はたら】いていました」
is incorrect, since that ～てい(まし)た phrasing puts the action firmly in the past,
as a completed event -- much like the English _" we **[had] worked** "_.

