When I passed by, I heard her _____ in the room.A.singsB.sang C.singingD.to sing

When I passed by, I heard her _____ in the room.A.singsB.sang C.singingD.to sing

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When I passed by, I heard her _____ in the room.
A.singsB.sang C.singingD.to sing

答案
C
解析
sings 用于单数第三人称主语后面sang 过去时中singing表示正在进行的动作, to sing表示将要发生的动作,根据上文当我经过时,可知选C,我听见她正在房间里唱歌。
举一反三
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A.LivingB.Having livedC.Being livedD.Lived

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A.reducingB.to reduceC.reducedD.reduce

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