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
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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
单项选择题
The answer ______ this question is known ______ us all.
A．to; by
B．of; to
C．of; of
D．to; to
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