单项选择题

It's high time we ______.cutting down the rainforests.

A．stopped
B．had to stop
C．shall stop
D．stop
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单项选择题
______ dull he may be, he is certainly a very successful top executive.
A．Although
B．Whatever
C．As
D．However
单项选择题
If only I ______ play the guitar as well as you!
A．would
B．could
C．should
D．might
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