单项选择题

At no time will China be the first nation ______ nuclear weapons.

A．used
B．which used
C．using
D．to use
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单项选择题
His work ______, the porter felt tired out.
A．has finished
B．finishing
C．was finished
D．finished
单项选择题
This danger is certainly a ______ in the way.
A．lion
B．snake
C．tiger
D．bear
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