单项选择题

If you ______ smoking, your health will improve soon.

A．gave up
B．give up
C．had given up
D．will give up
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单项选择题
I ______ to the English get-together last night, but I fell ill.
A．did came
B．had come
C．would come
D．would have come
单项选择题
One third of the population here ______ Europeans.
A．are
B．is
C．was
D．is to be
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