题目内容

They _____ friends since they met in Shanghai.
A．have madeB．have becomeC．have beenD．have turned
C

此题考查时态的用法。此题句意为：自从他们在上海见面以来就成为朋友了。因为含有时间状语，所以必须使用延续性动词be.故选C.
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