题目内容
The girl was often heard ______ happily in her room.
- A.sing
- B.to sing
- C.singing
- D.sings
B
解析:
hear sb do sth表示听到某人做某事,变为被动语态时其句式结构为 be heard to do sth.
解析:
hear sb do sth表示听到某人做某事,变为被动语态时其句式结构为 be heard to do sth.
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