单项选择题

He explained everything over and over again ______ anyone should misunderstand him.

A．since
B．when
C．lest
D．as if
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单项选择题
Because of the complexity of the modern machine, most offices require secretaries ______.
A．to have specified training
B．specified in traing
C．to train secifiedly
D．training specified
单项选择题
He wanted very much to run for a second term, but owing to poor health, he was ______ to give it up.
A．driven
B．permitted
C．rebuked
D．compelled
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