单项选择题

Go along the street ______ you reach the end of the road.

A． if
B． when
C． until
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单项选择题
—May I come in —______.
A． Yes, please
B． No, you couldn't
C． No, you must
单项选择题
English is spoken ______ many countries.
A． in
B． for
C． of
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