题目内容
The girl is often heard _______ in the next room.
A.sing | B.to sing | C.singing | D.sings |
B
hear sb do sth表示听到某人经常做某事,变为被动语态时要把不定式符合to加上,变为be heard to do sth.
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题目内容
A.sing | B.to sing | C.singing | D.sings |