he airport has been in ___ since 2000 (serve)请问括号里填什么?

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• he airport has been in ___ since 2000 (serve)
• he airport has been in ___ since 2000 (serve)请问括号里填什么?
• My uncle has been to Beijing ( ).He will go there for a third time next year括号里填什么单词?
• 完成时跟过去时的区别?我总是分不清完成时跟过去时的区别 这里有两个具体的例子 1.Ben (has been )a teacher for nearly three years.括号里为什么不能填was呢 现在完成时与过去时有什么区别呢?2.--I have bought you the books you want.–Oh,good,I(was)afraid you had forgotten.括号里为什么不能换成had been呢?过去完成时跟过去时有什么区别?3.有since作“从……”讲 就一定要加完成时吗 过去时 现在时 可以吗
• The airport has been in s____since 1998.横线上应该填什么单词?
• The shop has been open since 2008.这句话有错吗?since 2008前是延续还是瞬间的?