Hardly _ out of the cave when there was a big bang and the entrance was blocked.A. I did r

问题补充：

Hardly _ out of the cave when there was a big bang and the entrance was blocked.

A. I did rush

B. I had rushed

C. did I rush

D. had I rushed

答案：

A. I did rush

B. I had rushed

C. did I rush

(答案→)D. had I rushed

解析：考查时态和倒装句。固定结构：hardly…when…一…就…；hardly几乎不，是一个半否定词，放在句首的时候，后面要使用部分倒装的形式。根据there was说明rush out of the cave是在when…之前就发生的事情，故使用过去完成时的形式。