问题

The reason for all the changes being made _______to us yet
A:has not explained
B:has not been explained
C:did not explained
D:were not explained
B:has not been explained
C:did not explained
D:were not explained
正确答案是:
同类题型
stepped out of the church, the clock hadjust ______ eleven
The novel is so badly written that I can hardly ________what the writer is trying to say.
He is so careless that he always ______hisschool things at home.
_______ warmly for his work, he was too to fall asleep
Why didn’t you tell him about the meeting?—He rushed out of the room_____I could say a word