问题补充：
To my great joy．I got a chance to take a photo with Andy after the vocal concert, which I forward to for years．
A. have been looking
B. had been looking
C. looked
D. had looked
答案：
A. have been looking
(答案→)B. had been looking
C. looked
D. had looked
解析：句意：让我非常高兴的是，在演唱会后我有机会和Andy拍照，这是多年我一直盼望的事情。因为前面说I got a chance to take a photo with Andy after the vocal concert,所以“盼望”是过去的过去一直在做的事情，用过去完成进行时，所以选B。
