When the engine would nto start,the mechanic inspected all the parts to find what was at____.

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问题 When the engine would nto start,the mechanic inspected all the parts to find what was at____.

选项 A、wrong
B、trouble
C、fault
D、difficulty

答案C

解析各项的意思是：at fault是固定搭配，意思是“出故障，出差错”。wrong“错误的”，是形容词，不与at搭配；trouble与in搭配；difficulty也与in搭配，不与at搭配。

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