－Certainly.We____friends since ten years ago.A.were B.have made C.have become D.have been为什么不能选择c?

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－Certainly.We____friends since ten years ago.A.were B.have made C.have become D.have been为什么不能选择c?
－Certainly.We____friends since ten years ago.A.were B.have made C.have become D.have been
为什么不能选择c?

－Certainly.We____friends since ten years ago.A.were B.have made C.have become D.have been为什么不能选择c?
become是终止性动词,其的现在完成时的肯定式不能与FOR/SINCE 短语连用,正确答案是D

在定语从句中，当句子有和for+一段时间或者since+时间点/一般过去式的句子，句子中的短暂性动词要转变为持续性动词，borrow——keep， buy——have，。。。。。。D是正确答案，如选C，要把后面部分删除，改为：We have become friends.就可以了。

因为在since做时间词的时候，句子中的动词应该是完成时，要把短暂性动词变为持续性动词，而become不是持续性动词，所以不可以选C。而be是在since的句子中也变为持续性动词，所以正确答案选D。

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