单项选择题

The day‘s work _____, Mary and Carl are playing cards.

A．are done
B．done
C．doing
D．did
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单项选择题
When you have finished with that video tape, don‘t forget to put it in my drawer, _____
A．do you
B．will you
C．don‘t you
D．won‘t you
单项选择题
The physicist has made a discovery, _____ of great importance to the progress of science and technology.
A．I think which is
B．that I think is
C．which I think is
D．which I think it is
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