单项选择题

The only candidate ______ can hope to defeat him is quit now.

A．who
B．which
C．that
D．when
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单项选择题
The ______ of AIDS has led to an expansion in research seeking a cure.
A．innovation
B．selection
C．proliferation
D．conviction
单项选择题
George was introduced to ______ activities at a young age, when he was hired to act as a lookout for drugdealers.
A．illegal
B．lawful
C．faithful
D．peaceful
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