【题目】Hardly ___________the door when he rushed into the office out of breath.
A.I opened
B.did I open
C.I had opened
D.had I opened

【答案】D
【解析】本题考查hardly...when 结构，表示“一……就、刚刚……就”；句意：我刚把门打开，他就气喘吁吁冲进办公室。hardly 以及含有否定意义的副词放在句首，句子用倒装结构，故选D。