单项选择题

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
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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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