单项选择题

The investigation group, which（）two men and three women, set out last week.

A．composed of
B．composes of
C．is composed of
D．are composed of

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（）, he can quickly find out what's wrong with the machine.

A．Having been well trained
B．Having well trained
C．To have been well trained
D．To have been well trained
单项选择题
Her latest book（）how important freedom is.

A．speaks
B．says
C．demonstrates
D．assumes
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