He wasn't heard _____in the class room.A. to sing B.sing C.sings D.singings

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He wasn't heard _____in the class room.A. to sing B.sing C.sings D.singings
He wasn't heard _____in the class room.
A. to sing B.sing C.sings D.singings

He wasn't heard _____in the class room.A. to sing B.sing C.sings D.singings
A

A。
heard sb do sth 变成被动语态后 动词不定式带to be heard to do

选A 感官动词使用被动语态的时候得还原to.