gmat的语法题
NotoneofthepotentialinvestorsisexpectedtomakeanoffertobuyFirstInterstateBankuntilamergeragreementissignedthatincludesaprovisionforpenaltiesifthedealwerenottobeconcluded.
A.isexpectedtomakeanoffertobuyFirstInterstateBankuntilamergeragreementissignedthatincludesaprovisionforpenaltiesifthedealwere
B.isexpectedtomakeanofferforbuyingFirstInterstateBankuntiltheysignamergeragreementincludingaprovisionforpenaltiesifthedealwas
C.isexpectedtomakeanoffertobuyFirstInterstateBankuntilamergeragreementbesignedbythemwithaprovisionforpenaltiesifthedealwere
D.areexpectedtomakeanofferforbuyingFirstInterstateBankuntilitsignsamergeragreementwithaprovisionforpenaltiesincludedifthedealwas
E.areexpectedtobemakinganoffertobuyFirstInterstateBankuntiltheysignamergeragreementincludingaprovisionforpenaltiesifthedealwere
划线部分看选项a,这道题我在管卫东31套里做到两遍,但是一套答案是选a,一套答案是选c,我非常的搞不懂,求高人解释里面有几个语法点,谢谢了!
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