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
I don't think the blouse need any ______ . It fits you perfectly.
A．revision
B．variation
C．change
D．alteration
单项选择题
I wonder who wiped the windows so clean. Your mum ______ it, for she was out the whole day.
A．couldn't do
B．mustn't do
C．shouldn't have done
D．couldn't have done
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