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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单项选择题
______, 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
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