She was heard __A______ an English song.A.to sing B.sing C.sang D_英语解答

She was heard __A______ an English song.A.to sing B.sing C.sang D.to be sang 写下详解（语法）

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解答

这个句子是hear somebody do something所变成的被动结构.在主动结构中,动词不定式做hear的宾语补足语时,要省略to,但在变成被动结构时,动词不定式符号to就不能省了.