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
Great efforts to increase wheat production must be made if bread shortages ______ avoided.
A．will be
B．can be
C．are to be
D．were to be
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