【单选题】 When the engine would not start, the mechanic inspected all the parts tofind what was at ___. A、 wrong B、 trouble C、 fault D、 difficulty

【单选题】

When the engine would not start, the mechanic inspected all the parts tofind what was at ___.

A、

wrong
B、

trouble
C、

fault
D、

difficulty

出自：西安科技大学-大学英语2

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