单项选择题

21（）

A．Furthermore
B．Or
C．Hence
D．However

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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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Some warm-blooded animals ______ hibernate.
A．need not
B．does not need
C．not need
D．do not need
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