Hardly ______ when a loud explosion was heard.A、the train had startedB、the trai

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问题 Hardly ______ when a loud explosion was heard.

选项 A、the train had started
B、the train had been started
C、had the train started
D、did the train start

答案 C

解析句意火车刚一开动，就听到了一声很响的爆炸声。hardly．．．when意为“刚一……就……”。hardly后用过去完成时态，并且要倒装，when后用一般过去时态。

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