问题: 非谓语动词选择题
_,he can quickly find out what's wrong with the machine. A.Having been well trained B.To have been well trained
解答:
A.Having been well trained
该结构的逻辑主语与主句一致,表示原因！
还原：Because he has been well trained, he can quickly find out what's wrong with the machine.
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