单项选择题

______ how to do, the little boy cried.

A．Not knowing
B．Don't know
C．Knowing not
D．Not known
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单项选择题
Hardly in my life ______ such a thing.
A．I experienced
B．have I experienced
C．had I experienced
D．I experience
单项选择题
This factory can ______ 10,000 bikes every year.
A．turn out
B．turn up
C．turn in
D．turn over
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