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

游客2023-09-28  31

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 have been well trained
D、To have been well trained

答案 A

解析 做完作业后,他出去了。
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