单项选择题

It' s time ______about the noise pollution late at night.

A．something will be done
B．everything is done
C．something was done
D．everything will be done

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单项选择题

______is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth

单项选择题

I don' t doubt ______ he will come on time.

A．whether
B．which
C．what
D．that

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