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My teacher was supposed to ( ) Shanghai for London last week.
A、leave
B、have left
C、leaving
D、having left
【正确答案】：B
【题目解析】：be supposed to do sth. 本该做某事。时态是last week 过去式，因此用to have been，答案为have left。句子含义是我的的老师上周本打算离开上海。