___________ ,we should have arrived earlier.

___________ ,we should have arrived earlier.
A) Because the heavy rain
B) As to the heavy rain
C) Owing to the heavy rain
D) But for the heavy rain
There are ________ are underdeveloped.
A) some areas where
B) some areas where that
C) some areas in which
D) some areas which
____________ we had finished our experiments that we made our reports on them.
A) It is not until when
B) It is only that
C) It was only since
D) It was only when
书上的答案是 C,D,A