Bynight-fallprotestors(抗议者)againstwaronIraqwerealsoonthemoveinNorthand

发布时间：2020-08-04 19:21:59

By night-fall protestors(抗议者)against war on Iraq were also on the move in North and South America in a day of marches _________ since the Vietnam War caused protests around the world．A.seenB.sawC.having seenD.had seen

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A解析该题考查非谓语动词.句中marches与see是被动关系，应填过去分词seen作后置定语，表示已完成的被动动作,修饰marches.
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