The girl was often heard ( ) happily in her room.A.sing B.to sing C.singing D.sings可是也有人说是C,究竟是哪个呢?

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The girl was often heard ( ) happily in her room.A.sing B.to sing C.singing D.sings可是也有人说是C,究竟是哪个呢?
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The girl was often heard ( ) happily in her room.A.sing B.to sing C.singing D.sings可是也有人说是C,究竟是哪个呢?
The girl was often heard ( ) happily in her room.
A.sing B.to sing C.singing D.sings
可是也有人说是C,究竟是哪个呢?

The girl was often heard ( ) happily in her room.A.sing B.to sing C.singing D.sings可是也有人说是C,究竟是哪个呢?
在主动语态中.感官动词(如see、heard等)后的动词用三种1.原形2.动名词(表示正在进行) 3.动词过去分词(表示宾语的被动) 结构为:感官动词+宾语+三种动词结构.其中to 是被省略的.
而在被动语态中.要把to还原.
则:感官动词+宾语+三种1.to do 2.to be doing 3.to be done
根据你的句子.指的是被动语态中的第一种情况.
所以用B.

B
此题考点是
hear 主动结构式 hear sb do/doing sth 这个时候不可以又to
hear后事接省掉to的不定式做宾补
但是被动to要还原
像see,make 啊 都是这样的

B to sing ( hear 被动语态的结构是: be heard to do sth.)

A.强调全过程。如果没有often,则填C恰当。表示听到的时候这个动作正在进行。

C是肯定不对的啦~~~~
咱ls那位解释得多清楚啊!
要是看明白了就不会选C了喽。。。