单项选择题

They()friends since they met in Shanghai.

A．have made
B．have turned
C．have become
D．have been

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单项选择题

The teacher asked his students what oil was().

A．made of
B．made by
C．made up of
D．made from

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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