问题补充：
The crazy fans patiently for two hours and they would wait till the movie star arrived.
A. were waiting
B. had been waiting
C. had waited
D. would wait
答案：
A. were waiting
(答案→)B. had been waiting
C. had waited
D. would wait
解析：因为would wait是过去将来时，可见此事发生在过去，再结合for two hours可知，wait这个动作是从过去某一时刻开始一直延续到另一个过去时刻，并且还在等，一直要等到那位影星到来，所以用过去完成进行时：had been doing，因此选B。
