一道高中英语题:ButIthinkyoushouldhave.
"Ididn'tgotoseeourformerteacherwhileinBeijing."
"ButIthinkyou_______."
A.shouldB.shouldhaveC.oughttoD.musthave
答案为B.请【准确】回答为什么.不会的不要瞎答,谢谢.
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