单项选择题

______ had enough time, they would have visited the Great Wall.

A．Had they
B．Have they
C．Would they have
D．If they
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单项选择题
It s reported that by the end of this month the output of cement(水泥) in the factory ______ by about 10%.
A．will have risen
B．rises
C．will be rising
D．has been rising
单项选择题
I have no idea what Mary ______ at this time tomorrow.
A．will be doing
B．is doing
C．will do
D．does
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