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1.We haven¡¯t seen Miss Liu_________three years£®
2.Haven¡¯t you visited your hometown__________you left there?
3.The Greens bought the house__________ the year 2012£®
4.--How soon will you come back to your city?
--_______about two weeks£®
5.Mrs£®Smith has stayed in the hotel_________five hours ago£®
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