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
He found it necessary for us ______ from each other.
A．to help and learn
B．helping and learning
C．to learn and help
D．learning and helping
单项选择题
Please take your ______ things—money, jewelry, cameras and so on with you when you go out of the hotel.
A．expensive
B．worthy
C．precious
D．valuable
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