单项选择题

It is not uncommon for there（） problems of communication between the old and the young.

A．being
B．would be
C．be
D．to be

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单项选择题
Ii is absolutely essential that William（）his study in spite of some learning difficulties.

A．will continue
B．continued
C．continue
D．continues
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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