单项选择题

（）for your advice, we'd never have been able to overcome the difficulties.

A．Had it not
B．If it were not
C．Had it not been
D．If we had not been

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单项选择题
Children shouldn't（）on the conversation between their parents and others.

A．break in
B．break down
C．break out
D．break away.
单项选择题
Both approaches require that the actor（）his or her own personal values as well as the character' s.

A．must understand
B．should understand
C．has to understand
D．need to understand
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