高二英语选择题sorrysir,icantanswerthequ
sorry sir,i cant answer the questn ---well you are supposed ____ the part of history a to be reading b to read c having read d to have read 答案选择d为什么
be supposed to do是固定词组,应该做某事 此题也可以等效于you should have read the part of history, 其中should have done 是情态动词的一种特殊用法,表示本应该做某事而实际上没做,同样shouldn't have done表示本不应该做而实际做了