WhenIenteredtheclassroominahurry,IsuddenlyrealizedI

问题详情：

 When I entered the classroom in a hurry, I suddenly realized I _____ all my homework at home.

   A. has left        B. left                     C. had left     D. was leaving

【回答】

C

知识点：过去完成时及其被动式

题型：选择题