what _____ they _____ they are ____ ____ this book

what _____ they _____ they are ____ ____ this book
a.are ding,talk to
b.do do talk with
c.are doing talking with
d.are doing talking about
英语人气:744 ℃时间:2019-11-07 13:00:03
优质解答
What are they doing?They are talking about this book.
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