A.Hardly would he reach school

B.Hardly had he reached school

C.Hardly he reached school

D.Hardly he was reaching school

【答案】B

【解析】

句意：他刚到学校，铃就响了。考察固定句型hardly…had when…这是一个倒装句，可以还原为He had hardly reached school when the bell rang.故选B。