单项选择题

A survey of the opinions of students （）that they also admit several hours of  sitting in front of the computer （）harmful for one’s health.

A．show; are
B．shows; is
C．show; is
D．shows; are

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单项选择题
Theroomisinaterriblemess;it（）cleaned.

A．can’t have been
B．shouldn’t have been
C．mustn’t have been
D．will have been waiting
单项选择题
You（）thedifficultiesafterIexplainthewholethingtoyou.

A．will be seen
B．will have seen
C．will see
D．see
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