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
The student said there were a few points in the essay he（）impossible to comprehend.

A．had found
B．finds
C．has found
D．would find
单项选择题
For some time now, world leaders （） out the necessity for agreement on arms reduction.

A．had been pointing
B．have been pointing
C．were pointing
D．pointed
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