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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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
Mary （） in bed all day because she had a fever.

A．lay
B．has laid
C．has lain
D．laid
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