单项选择题

I heard that George ______ Canada for a year.

A．had been in
B．had gone to
C．have been to
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单项选择题
______you practice, ______ you have to review before the test,
A．More exercises... less time
B．The more exercises... less time
C．The more exercises... the less time
单项选择题
It's hard for a smoker to ______ smoking.
A．give in
B．give on
C．give up
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