--Do you know Mary very well? --Yes, she and I _______ friends since we met in university 20 years ago. 选择一项： A. have become B. have been C. have made D. have turned

--Do you know Mary very well?
--Yes, she and I _______ friends since we met in university 20 years ago.

选择一项：
A. have become
B. have been
C. have made
D. have turned

出自：广东开放大学英语语法与基础写作

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