Mrs Brown is supposed ____ for Italy next week.A.to have lef

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Mrs Brown is supposed ____ for Italy next week.A.to have left B.to be leaving C.to leave

C
be supposed to do sth 应该
leave for 动身去
布朗先生应该下周动身去意大利
再问：能否解释一下三者的区别？因为这本教辅的答案并不是C，而我觉得3者没什么差别。
再答： A 　完成时，已经动身，后面说了是下周，所以还没去，不对 B　现在进行时，也不符合这里是用动词不定式表示将要发生的事 ~~~~~~~~~~～～~~~~祝你进步，如对你有帮助，请及时采纳~~~~~~~~~~~~~~~~

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