He___in the classroom just now , he ___be there now A. heard to sing , may B.was heard singHe___in the classroom just now , he ___be there now A. heard to sing , mayB.was heard sing ,must c.heard sing , must. D.was heard to sing , may
问题描述：
He___in the classroom just now , he ___be there now A. heard to sing , may B.was heard sing
He___in the classroom just now , he ___be there now A. heard to sing , mayB.was heard sing ,must c.heard sing , must. D.was heard to sing , may
答
选B,听到某人做某事是hear sb do sth 这里是被听到 所以排除A和C；根据句意表肯定推断，是must be 所以选B
答
B 第一个空主动语态是hear sb do sth ,变成被动是be heard do sth
第二空must表示肯定推测,一定还在那里