用They often singing and dancing还是用sing and dance

初二的问题She ____ the song yesterday. A heard，sing B heard，to sing C was heard，to sing D was heard,to singing

C was heard，to sing 句子意思"他昨天被听见唱歌"　 有一个结构是hear sb sing与hear sb singing(其中sing表示已完成singing表示正在进行，) 这个结构用于被动时要加to (除非动作到现在仍在进行,才用现在分词,但不要to) 这里是表示被动的　是她被听见唱歌　而且又是已经完成的动作　所以C was heard，to sing 如果要表示主动　 则因该是she heard sb sing the song或者是 she hear the song A因该改为she heard sb sing the song B she was heard...全部

  C was heard，to sing 句子意思"他昨天被听见唱歌"　 有一个结构是hear sb sing与hear sb singing(其中sing表示已完成singing表示正在进行，) 这个结构用于被动时要加to (除非动作到现在仍在进行,才用现在分词,但不要to) 这里是表示被动的　是她被听见唱歌　而且又是已经完成的动作　所以C was heard，to sing 如果要表示主动　 则因该是she heard sb sing the song或者是 she hear the song A因该改为she heard sb sing the song B she was heard to sing the song 而D　前面说过　　并不是进行到现在　所以不用进行时　而且又不用to 。
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