单项选择题

--Must I turn off the light when I leave
--No, ______.

A．you mustn't
B．you can't
C．you needn't
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单项选择题
We all enjoyed ______ on the farm.
A．works
B．working
C．work
单项选择题
He came and ______ without saying a word.
A．go
B．went
C．going
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