He had a clear______of what was wrong with the machine and fixed it in a short time.

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问题 He had a clear______of what was wrong with the machine and fixed it in a short time.

选项 A、debris
B、deficiency
C、perception
D、persecution

答案C

解析本句是说他非常清楚机器出了什么毛病，一会儿就把它修好了。perception“理解，感知”与句意相符。而debris“碎片，残骸”；deficiency“缺乏，不足”；persecution“迫害”都不正确。

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