单项选择题

It is not clear how much English students can learn ______the Internet.

A．in
B．with
C．by
D．through
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单项选择题
--Could you give me a lift home, please--Sorry______.
A．I have visited my sister
B．I visited my sister
C．I am visiting my sister
D．I visit my sister
单项选择题
My friend Mr. Black has come to China every year ______he was a boy.
A．since
B．when
C．before
D．after
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