When I knocked at the door , I heard her in the room .A. sings B. singing C. to sing

发布时间：2020-08-20 19:33:21

When I knocked at the door , I heard her     in the room .
A. sings  B. singing  C. to sing

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解析：本题考查非谓语动词。Hear sb doing sth听到某人正在做某事。句意：当我敲门的时候，我听到她在室内唱歌。
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