单项选择题

Some warm-blooded animals ______ hibernate.

A．need not
B．does not need
C．not need
D．do not need
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单项选择题
I haven't seen him for quite a long time, but his parents ______ him sometimes.
A．still saw
B．still see
C．have still seen
D．has still seen
单项选择题
He ______ a cold last week.
A．had caught
B．caught
C．has caught
D．has had
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