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用for或since填空:(1)Mr Li has taught in the school______he gradu

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用for或since填空:(1)Mr Li has taught in the school______he graduated from the college.
(2)The old woman has waited for you_____five hours.
(3)The meeting has been on_____several minutes.
(4)The couple have been married_____1999.
(1)since
(2)for
(3)for
(4)since