单项选择题

I think the beef must have been rotten, it ______ unpleasant smell.

A．gives off
B．gives up
C．gives in
D．gives out
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单项选择题
______ his address, I can't visit him personally.
A．Not known
B．Not knowing
C．Haven't know
D．Don't know
单项选择题
Writing books ______ a very difficult task.
A．was
B．were
C．is
D．are
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