______ , he can quickly find out what’s wrong with the machine.A、Having been wel

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

选项 A、Having been well trained
B、Having well trained
C、To be well trained
D、To have been well trained

答案 A

解析本题测试的是非谓语动词的用法。主句主语he是动作train的接受者，且该动作已经完成。故选A。

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