问题
选择题
When I knocked at the door , I heard her______ in the room .
A. sings B. singing C. to sing
答案
答案：B
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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When I knocked at the door , I heard her______ in the room .
A. sings B. singing C. to sing
答案：B
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。