【高中情态动词题1,yoursistermustbeathome,_______she?A,isn'tBdoesn'tCmustn'tcan't2,theyhadtocatchtheearlybus,________they?Ahadn'tBdidn'tCmustn'tDcan't3,Hemusthavebeenabroad,_______he?Ahaven'tBhasn'tCisn'tDdidn't请问关】

　　高中情态动词题

　　1,yoursistermustbeathome,_______she?

　　A,isn'tBdoesn'tCmustn'tcan't

　　2,theyhadtocatchtheearlybus,________they?

　　Ahadn'tBdidn'tCmustn'tDcan't

　　3,Hemusthavebeenabroad,_______he?

　　Ahaven'tBhasn'tCisn'tDdidn't

　　请问关于情态动词的反义疑问句怎么判断,