单项选择题

______ of them has been to Beijing before.

A． Each
B． Both
C． An
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单项选择题
He ______ the house twelve years ago.
A． bought
B． has bought
C． had bought
单项选择题
— ______ do you go to see your parents —Once a week.
A． How often
B． How long
C． How soon
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