The wonderful time they had been looking forward at last.A. to arrive 　　　B. to arrived 　　

问题补充：

The wonderful time they had been looking forward at last.

A. to arrive

B. to arrived

C. to arriving

D. should arrive

答案：

A. to arrive

(答案→)B. to arrived

C. to arriving

D. should arrive

解析：考查时态。句意：他们一直盼望的美好时刻终于到了。they had been looking forward（盼望）后面缺少介词to，结合语境可知本句描述的是过去发生的动作，故用过去时态。故选B。