We didn’t expect them for us when we arrived there so late.A. to be waitingB. to have bee

问题补充：

We didn’t expect them for us when we arrived there so late.

A. to be waiting

B. to have been waiting

C. to have waited

D. to wait

答案：

(答案→)A. to be waiting

B. to have been waiting

C. to have waited

D. to wait

解析：句意：我们没有预料到他们会正在等我们当我们到那很晚的时候。短语：期望某人做某事，expect sb to do，期望某人做某事，根据语境他们当时正在等，所以用不定式的进行时。选A。