单项选择题

The question is worth ______ again.

A．discussing
B．to discuss
C．discussed
D．discuss
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单项选择题
It will be a great advantage to be able to speak a foreign language, especially if you are ______ business.
A．to
B．with
C．on
D．in
单项选择题
It was Japan ______ launched the war against China.
A．that
B．when
C．whom
D．which
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