单项选择题

______you carry out this plan, you will benefit from it.

A．If only
B．Only if
C．Were
D．Unless
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单项选择题
He raised his arms to ______his face from the blow.
A．protest
B．protect
C．prevent
D．keep
单项选择题
Justice, as well as the law, ______that these robbers be severely punished.
A．demands
B．have demanded
C．is demanding
D．demand
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