单项选择题

The worker are busy_________ models for the exhibition.

A．to make
B．with making
C．being making
D．making
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单项选择题
_________he says or does won’’t make me change my mind at all.
A．Whatever
B．However
C．Which
D．How
单项选择题
Since this road is wet and slippery this morning, it_________ last night.
A．must rain
B．was raining
C．must have rained
D．may rain
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