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

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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

单项选择题

Only yesterday （） out that my documents were missing.

A．did I find
B．I found
C．I have found
D．Had I found

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