单项选择题

Look, the trees are fallen; there ______ a strong wind last night.

A．must be
B．should have been
C．must have been
D．could be
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To get the best prices, it is advisable ______ at least 24 hours before you arrive.
A．you book
B．for you come
C．you will take
D．your buying
单项选择题
I don't know him, but it is ______ that he is a warm-hearted person.
A．talked
B．said
C．C ) told
D．spoken
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