选C
自从他们在上海认识后,他们一直是朋友.
从那时到现在一直是,所以用现在完成时.
也可以以since为标志,有since的句子一般用完成时.
又因为be不是瞬间动词,所以选C
They___friends since they met in shanghai?A.have made B.have become C.have been D.have had
They___friends since they met in shanghai?A.have made B.have become C.have been D.have had
英语人气：753 ℃时间：2019-08-21 12:32:12
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