单项选择题

He is wet to the skin. It()heavily.

A.must be raining
B.must rain
C.may be raining
D.must have rained

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It was John()she sent these postcards.

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B.whom
C.who
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单项选择题
It is necessary that a student()his lesson before coming to class.

A.will prepare
B.prepares
C.must prepare
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