单项选择题

We all enjoyed ______ on the farm.

A．works
B．working
C．work
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单项选择题
Shanghai is one of ______ cities in the world.
A．big
B．the bigger
C．the biggest
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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