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7. It's been three years since we last saw our primary school classmates. 我们已经有三年没见到我们的小学同学了。
1)It’s been + 一段时间 + since + 从句 = It’s + 一段时间 + since + 从句 , 意为“ 自从…..以来已经有多长时间了。
自从我开始学英语已经有5年的时间了。 It ha been five years since I began to learn English. = It’s five years since I began to learn English.
2)since是连词,意为“自从;从……以来”。本句由since引导时间状语从句we last saw our primary school classmates,从句的时态是一般过去时,主句是现在完成时。
since还可以作介词,意为“自从;从……以来”。如:
She has been ill since last Sunday. 从上星期日以来,她一直在生病。
-The local living conditions(条件) have improved a lot ________ China set up the city of Sansha.
-And more and more people would like to go there for business.
A.before B.when C.since D.after