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
网友回答
(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。