单项选择题

I don't know whether you happen ______ but I'm going to study in the U.S. A. this September.

A．to be heard
B．to be hearing
C．to hear
D．to have heard
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单项选择题
--Would you mind repeating what you said, I didn't ______. --Of course not.
A．catch on
B．go on
C．keep on
D．insist on
单项选择题
--I'd like to take a week's holiday. -- ______, we're too busy.
A．Don't worry
B．Don't mention it
C．Forget it
D．Pardon me
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