单项选择题

If you try to pass （） the problems, it would be impossible for you to make any progress in this field.

A．off
B．over
C．by
D．across

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单项选择题

Once he set his mind to（）something, he would not give up easily.

A．do
B．doing
C．be doing
D．having done

单项选择题

Were it not for your help, I （） in trouble now.

A．was
B．were
C．had been
D．would be

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