题目内容
Our music teacher is always heard _______ in the music room.
A.sing | B.sang | C.singing | D.to sing |
D
hear sb do sth表示听到某人经常做某事,变为被动语态时结构变为be heard to do sth.
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题目内容
A.sing | B.sang | C.singing | D.to sing |