单项选择题

Leap year comes ______ four years, and in that year February ______ 29 days.

A．for... has
B．each... has
C．every... has
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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
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
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