"which" can be used when there's, for example, a selection of books in front of …
Which one is your favorite book? you use which one when you have 2 or more options …
英语 (英国) That is my book. That yellow coloured book of mine has gone missing …
I would use “is written by” if it’s a current book that was made recently, if I’m talking about …
6. Do you know who is the first in the competition? 7. I wonder which is your book. …
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