题目内容
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 |
B
解析试题分析：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。
考点：考查非谓语动词
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