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—Do you know Betty very well?——Yes ,she and I ___friends sin

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—Do you know Betty very well?——Yes ,she and I ___friends since we met in Guangzhou last summer.
A.have made B.have become C.hace been D.hace turned
,为什么?
为你解答.
——Do you know Betty very well?
——Yes ,she and I (C. hace been) friends since we met in Guangzhou last summer.
自从去年夏天,我和她在广州就已经是好朋友了.
解释:时间状语是since引导的一段时间,所以动词必须是延续性的,而make, become, turn这几个都是短暂性的动词,都不能选.