We often hear him ______ in the classroom.A.sing B.singing C.to sing D.sung到底是选sing 还是singing呢具体理由

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We often hear him ______ in the classroom.A.sing B.singing C.to sing D.sung到底是选sing 还是singing呢具体理由
We often hear him ______ in the classroom.A.sing B.singing C.to sing D.sung
到底是选sing 还是singing呢具体理由

We often hear him ______ in the classroom.A.sing B.singing C.to sing D.sung到底是选sing 还是singing呢具体理由
A.hear sb. do sth.听某人做某事..因为句中有一个often表示经常发生的动作.我们用do表示.如果用singing,则是进行时.那就与often不符了

A sing
hear sb. do
经常听到唱歌，是过程，用原形

B
听到的时候正在唱
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选A hear sb do sth听见某人做某事hear sb doing sth听见某人正在做某事，强调进行希望回答对你有所帮助，请及时采纳吧，多谢！

singing 好些
因为从句意看，这里指的是情景，状况，而非全过程。即：
singing 在唱 sing唱了
你的支持就是我的动力！祝学习进步！谢谢！

A hear sb do sth ,听到某人做什么事。
B的话使正在唱

同意二楼

hear sb sing.听到某人唱歌..句中有often 经常，表经常听到他在教室里唱歌
hear sb singing,则是进行时，听到某人正在唱歌，一般会由when或while来引导而这句话通常用来呈现过去的事情，用过去时态 heard
例如：我们经过走廊 / 走进教室时听到他正在唱歌
we heard him singing when passing the ...

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We often hear him ______ in the classroom.A.sing B.singing C.to sing D.sung到底是选sing 还是singing呢 具体理由

We often hear him ______ in the classroom.A.sing B.singing C.to sing D.sung到底是选sing 还是singing呢具体理由