高三英语单选题!急求解答!
9Susanwasexpectingherfavoritesingers,buttoherdisappointment,______appeared.
A.someB.noneC.everyoneD.noone
10PleasemakesuretowatermyplantswhileIamgone.Iftheydon’tgetenoughwater,they______die.
A.canB.mustC.shouldD.might
11Mr.Greenwasoutoftownlastweek.He______amedicalconference.
A.willattendB.hadattendedC.wasattendingD.wouldattend
第一题选B不过B和D有什么区别?
第二题选BD可不可以呢?
第三题选C请问这几个时态间的区别
跪求解答!感激涕零!