拜托拜托了~
Only when he started to explain ________ the reason for this.
A.she realized B.did she realize
C.she had realized D.had she realized
After that we never saw her again nor _______ from her.
A.did we hear B.we heard
C.had we heard D.we have heard
Scarcely _______ the room _______ the phone rang.
A.I had entered…when B.Had I entered…then
C.had I entered…when D.have I entered…when
希望有详细的讲解,顺便说说每句的意思~~
谢谢了!!
参考答案是BAC