1 When_______,the museum will be open to the public next year.

题目

1 When_______,the museum will be open to the public next year.
A.completed B.completing C.being completed D.to be completed
2 _______in thought,he almost ran into the car in front of him.
A.Losing B.Having lost C.Lost D.To lose
3 -You look very tired.______at all last night?
-No,not really .I'm tired out now
A.Do you sleep
B.Were you sleeping
C.Did you sleep
D.Had you slept
..但是第三题的答案是B,我想知道为什么

答案

1.A
省略了,完整的应该是when it is completed,主将从现啊
2.C
固定用法,作状语
3.C
有具体时间,所以应该用一般过去时