There were lots of people , and not one of them offered to help.
A. standing watching
B. standing to watch
C. stood watching
D. stood to watch
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(答案→)A. standing watching
B. standing to watch
C. stood watching
D. stood to watch
解析:现在分词短语 standing watching 在此用作后置定语,句意为:当时有许多人站着观看,但其中没有一个人主动提供帮助。