entered the classroom the bell rang.
A. We hardly had, before
B. Hardly had we, when
C. Hardly had we, than
D. Hardly did we, when
网友回答
A. We hardly had, before
(答案→)B. Hardly had we, when
C. Hardly had we, than
D. Hardly did we, when
解析：hardly…when… “一…就…”。Hardly开头句子采用部分倒装而且后面的句子时态用过去完成时，when后的句子不倒装而且用一般过去时态。所以选B。