题目内容

【题目】The girl was often heard happily in her room.

A.sing B.to sing

C.singing D.sings

【答案】B

【解析】

试题分析:在主动语态中heard后用省略to的动词不定式作宾语补足语,而在被动语态中动词不定式符号to需补上。故选B

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