单项选择题

If I had not studied hard, I ______ in the exam.

A．had failed
B．would failed
C．would have failed
D．have failed
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单项选择题
In no case ______ give up the experiment.
A．would he
B．will he
C．he will
D．he would
单项选择题
It's no good ______ to him about the details of the plan.
A．to talk
B．talking
C．to talking
D．talked
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