单项选择题

______ , he can quickly find out what's wrong with the machine.

A．Having been well trained
B．Having well trained
C．To be well trained
D．To have been well trained
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单项选择题
It is no use ______ with him over the matter, he will not change his mind.
A．you argue
B．your arguing
C．you to argue
D．of you arguing
单项选择题
He suddenly left for Paris yesterday, ______ was more than we had expected.
A．that
B．what
C．which
D．this
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