题目内容

【题目】They ______ friends since they met in Shanghai．

A. haven't beenB. have been

C. aren'tD. are

【答案】B

【解析】

句意：自从他们在上海遇见后就成了朋友。

根据since可知主句用现在完成时态，结构是have/has+过去分词，排除C/D；根据句意since they met in Shanghai可知是自从上海遇见后就成了朋友；故选B。

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