He_in the classroom just now , he _be there now A. heard

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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

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

He___in the classroom just now , he ___be there now A. heard HE ( ) in the classroom just now.he ( )be there now there were five students in the classroom just now He was in the classroom just now.( )he in the classroom just A bird was heard __________in the tree just now. just now I heard students 【singing】in the classroom .为什么用sin leave the teacher the classroom just now I heard a little boy______English just now I saw___in the classroom just now I was in the classroom just now. there are many boys ----the classroom now when he heard the bell,he ran into the classroom ____?A.just