Hardly______whenthedoorsuddenlyclosedAtheyhadarri

Hardly ______ when the door suddenly closed.

A. they had arrived

B. they arrived

C. did they arrive

D. had they arrived

正确答案：D
9．答案为D他们刚到门突然就关上了副词hardly置于句首时主谓倒装助动词提前根据题意主句动作发生在从句之前从句中动词是过去式因此主句中的动词应该用过去完成式