问题标题:
Isawsomepeople___atthegateofourschoolA.standsB.tostandC.standingD.stood说明原因.
问题描述:

Isawsomepeople___atthegateofourschool

A.standsB.tostandC.standingD.stood

说明原因.

傅连祥回答:
  standing,   动名词做为people的后置定语
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