Hardly _____ to sleep when someone knocked at the door.

题目

Hardly _____ to sleep when someone knocked at the door.
A.he had gone
B.had he gone
C.did he go
D.he went
为什么不选c,答案选B

答案

B
因为这里knocked 已经是过去式了
所以按照句意就是：在某人敲门的时候他已经睡了.
以Hardly 开头全句倒装
所以选B