--- You may refuse my invitation , but you must explain why . --- Oh, I must ,

题干

--- You may refuse my invitation , but you must explain why .
--- Oh, I must , _____ ?

A．did I

B．didn’t I

C．must I

D．mustn’t I

上一题下一题 0.85难度单项选择更新时间:2010-06-28 08:01:08

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