I have a question again

[Dany]

Hello everyone,

In my book is a sentence which I have to complete with and, so, or but.

She can speak French, _________ she can't write it.

I wrote:
She can speak French, but she can't write it.

My books' answer is:
She can speak French, and she can't write it.

In my oppinion is "and" wrong in this sentence, isn't it

Kind regards,
Dany

[Francois]

'but' looks just fine to me

FRC

[Dany]

'but' looks just fine to me

FRC

That's also my opinion, but I want to know if "and" is wrong or not :?

[Francois]

I don't think it's correct.

FRC