【三道关于非谓语和虚拟语气的题.英语1.Whyhasn‘thecome?_____ontime,wewouldhavetoputoffthetrip.A.ifhedoesn'tcomeB.ifhewon'tcomeC.ifheshouldn'tcomeD.ifhehadn'tcome2.Thestudenswillhavemorediscussionslikethisi】

　　三道关于非谓语和虚拟语气的题.英语

　　1.Whyhasn‘thecome?_____ontime,wewouldhavetoputoffthetrip.

　　A.ifhedoesn'tcome

　　B.ifhewon'tcome

　　C.ifheshouldn'tcome

　　D.ifhehadn'tcome

　　2.Thestudenswillhavemorediscussionslikethisintheweeks______.

　　A.comingB.tocomeC.comeD.tobecoming

　　3.________halfwaythroughtheexercise,theteacherchangedhismindandcollectedallourpapers.

　　A.Whenonlybeing

　　B.Whenwewereonly

　　C.Beingonly

　　D.Havingbeen

　　能不能说下答案并告诉我其他选项错在哪,或用了什么语法搭配.