英语单选To our disappointment,the trip we had been looking forward to【 】in a heavy rain.

问题描述:

英语单选To our disappointment,the trip we had been looking forward to【 】in a heavy rain.
A,startingB,start,C,to start,D.started.

D
we had been looking forward to是后置定语,忽略它再进行选择就可以了