The engineer retired ______. What we can know about the retired engineer in this text?

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问题 The engineer retired ______.
What we can know about the retired engineer in this text?

选项 A、The retired engineer overcharged for his service.
B、The retired engineer happily went to examine the machine.
C、The retired engineer changed the broken part for a new one.
D、The retired engineer did find out what was wrong with the machine.

答案D

解析 由第二段可知,老人经过一天的仔细研究,查出了机器的毛病所在。但只是画出了标记,并未提到亲自换零件的事,故[C]项错误。
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