1,Could you tell me how many times Byou_____Yunnan i

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1,Could you tell me how many times __B____you_______Yunnan in the past fifteen years?
A.had,been to B.has,been to C.did,go to为什么不用过去时,就算排除了过去时,那A和B
B要怎么样选择?
2.Henlen _C___her keys in the office so she had to wait until her husband _____home.
B.has left ,came.C.had left,came 不是应该是现在完成时has left吗?@@

第一题用现在完成时是正确的,因为是现在在问这个问题,从过去15年到现在为止,表示已经完成了,不过我觉得应该用 have、
第二题后面有个had 表过去,所以用过去完成时

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