He is often heard _____ in the next room.A.singing B.sang C.to singing D.to sing 说清楚点

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He is often heard _____ in the next room.A.singing B.sang C.to singing D.to sing 说清楚点

He is often heard _____ in the next room.A.singing B.sang C.to singing D.to sing 说清楚点
He is often heard _____ in the next room.
A.singing B.sang C.to singing D.to sing
说清楚点

He is often heard _____ in the next room.A.singing B.sang C.to singing D.to sing 说清楚点
hear+to do ,强调的是动作的结果,也就是sing 的结果
hear+doing,强调的是动作的状态,也就是sing这个状态,本句意思是:人们经常听到他在隔壁唱歌,强调的是他唱歌这个状态,而没有说他唱歌的结果,所以选A不是D
这是高中常做的题,

A
LZ应该是初中生吧,我就简单一点讲
Hear后面只有两种形式,一种是原形(包括时态变化),一种是现分
这里应该用现分表持续(一般)状态
举一个原形的例子:
I used to hear she sang near the river.