单选题There was a knock at

问题补充：

单选题Therewasaknockatthedoor.Itwasthesecondtimesomeone_______methatevening.A.had interruptedB.would have interruptedC.to have intrruptedD.to intrrupt

答案：

A解析在“It was the first time (that)…”结构中，that分句中的谓语动词用常用完成时。