单项选择题

You will fall behind if you ______ hard.

A．didn't work
B．won't work
C．don't work
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单项选择题
Coffee ______ milk Milk ______ no sugar, thank you.
A．and... but
B．or... and
C．or... but
单项选择题
That hotel lies in the centre of the city______
A．isn't it
B．does it
C．doesn't it
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