单项选择题

I ______ my work by this time yesterday evening.

A．did
B．would do
C．had done
D．was doing
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单项选择题
Some warm-blooded animals ______ hibernate.
A．need not
B．does not need
C．not need
D．do not need
单项选择题
Why hasn't he come ______on time, we will have to put off the trip.
A．If he doesn't come
B．If he won't come
C．If he shouldn't come
D．If he hadn't come
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