问题补充：
They friends since they met in Shanghai.
A. have made
B. have become
C. have been
D. have turned
答案：
A. have made
B. have become
(答案→)C. have been
D. have turned
解析：
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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