When the engine would not start, the mechanic inspected all the parts to find what was at ______.

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问题 When the engine would not 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 at fault是固定搭配,意为“出故障,出差错”。A项wrong意为“错误的”,是形容词,不与at搭配;B项trouble与in搭配;D项difficulty也与in搭配,不与at搭配。
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