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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单项选择题
The question ______ at the meeting tomorrow is very important.
A．to discuss
B．being discussed
C．to be discussed
D．will be discussed
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单项选择题
Only recently ______ to deal with the environmental problems.
A．something has done
B．has something done
C．has something been done
D．something has been done
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