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I often hear her___the English song in her room.

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I often hear her___the English song in her room.
A sing
B to sing
C sings
D singing
答案是A我只是想知道hear sb do中的do 需要三单式变形吗
I often hear her___the English song in her room.
不需要变形 hear sb do sth 直接接原型
选A hear sb do sth 表示听见某人经常做某事
hear sb doing sth 表示听见某人正在做某事,题中often表示经常性动作,所以选A