Joan stood outside a shopping mall for a long time, as if somebody.
A. to wait for
B. waiting for
C. waited for
D. having waited for
网友回答
A. to wait for
(答案→)B. waiting for
C. waited for
D. having waited for
解析：考查非谓语动词。Joan和wait是主谓关系，用现在分词表主动和伴随状况，排除C；动词不定式表示目的，不符合语境，排除A；having done是现在分词的完成时，表示动作有先后，这里的stood和wait是同时发生的，排除D。waiting for相当于he was waiting for。故选B。