517.Did you watch the movie MeiLanfang in the People's Theatre last night?
I had planned to,but it _____ all the time.
A.is raining
B.was raining
C.has rained
D.had rained
518.I _____ to help you do homework,but I couldn't spare any time.I _____ a composition last night and I'll finish it today.
A.wanted;wrote
B.had wanted;was writing
C.have wanted;wrote
D.wanted;have been writing
517.答案是B;had planned/hoped/wanted to do sth.,but…句式，意为:过去本打算/本想干某事，但实际上并未干，再由all the time暗示，用过去进行时为宜。
518.答案是B;由but之后的时态暗示，此处表示的是过去的情况。
