单项选择题

When and where the meeting will be held ______ a mystery.

A．to remain
B．remain
C．remains
D．is remaining
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单项选择题
______ it left to me to decide, I would never hesitate to choose the former.
A．If
B．Were
C．Had
D．Should
单项选择题
The road is wet, it ______ rained last night.
A．would have
B．should have
C．could have
D．must have
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