She was often heard ( ) in English.AsingBsingingCsungDto sing答案选D,为什么不选A,

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She was often heard ( ) in English.AsingBsingingCsungDto sing答案选D,为什么不选A,
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She was often heard ( ) in English.AsingBsingingCsungDto sing答案选D,为什么不选A,
She was often heard ( ) in English.AsingBsingingCsungDto sing答案选D,为什么不选A,

She was often heard ( ) in English.AsingBsingingCsungDto sing答案选D,为什么不选A,
在主动句里,hear的用法是hear sb.do sth.听见某人做某事
但在其被动形式要加上to,变为be heard to do sth.被听见做某事
感官动词的词组变成被动语态时,要变成be ...to do sth.,必须要加上不定式符号to