Hardly ______ when a loud explosion was heard.

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问题 Hardly ______ when a loud explosion was heard.
本题考查句型hardly...when的用法。当表示否定的副词hardly放在句首时,该句需要倒装。因此本题答案为C。

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
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