问题描述：
Mr.Smith works in a mobile phone comapy,but he__ for this international meeting,since he is on
since he is on holiday.
A.works B.is working C.has worked D.had worked
请问选哪个选项,为什么?
since he is on holiday.
A.works B.is working C.has worked D.had worked
请问选哪个选项,为什么?
问题解答：
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