Doyouknow when_____（start）？
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It is a little difficult for me to (answer) the question.
He used to(play) tricks on his classmates.
The author devoted all his time to(write) this book.
—It's too hot. Would you mind_______ the door? —______.Please do it. now.
A. to open, OK
B. opening, Certainly not
C. opening, Of course
D. to open, Good idea
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