单项选择题

I'll let you know as soon as he ______.

A． came back
B． comes back
C． will come back
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单项选择题
Go along the street ______ you reach the end of the road.
A． if
B． when
C． until
单项选择题
—May I come in —______.
A． Yes, please
B． No, you couldn't
C． No, you must
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