—Where’s Mary now? Do you know?— No, but I heard ______ in her room a few minutes ago.

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问题 —Where’s Mary now? Do you know?— No, but I heard  ______  in her room a few minutes ago.

选项 A、her singing
B、her sing
C、she was singing

答案A

解析 感官动词hear/see等用分词作宾语补足语,表示听到或看到某人正在干某事。而跟不定式,则是表示看到或听到整个过程。
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