The wonderful time they had been looking forward at last.A. to arriveB. to arrivedC. to a

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。