单项选择题

The examination has been cancelled. You ______ all that revision, after all.

A．didn't need to have done
B．needn't have done
C．need to do
D．needn't do
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单项选择题
They ______ so tired if they ______ for a whole day.
A．wouldn't feel, didn't walk
B．wouldn't feel, weren't walking
C．wouldn't be feeling, weren't walking
D．wouldn't be feeling, hadn't been walking
单项选择题
Maggie tiptoed over and took the clock away because she hated to hear it ______ when she was trying to go to sleep.
A．sounding
B．humming
C．ticking
D．ringing
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