I knocked ---------a glass door because I thought there was

A：who knocked at the door?B:I thought is was Jack.这里为什么用was, Who knocked at the door?I thought it was Jack.回 I couldn't get through the door because there was a big box 1.I could not get through the door because there was a big s I ＿＿ when she knocked at the door.A.cook B.cooks C.was cooki he was simply out when I knocked on his door I thought there was somebody in the house because there was [选择]I thought there was somebody in the house because there I was late because there was a lot of t_____ 时态变化I was reading when someone knocked at the door.在该句前加I sa I thought that everything there was sensored .I knocked on the door ,but nobody _____ the door.A.closed B