问题: 选择题...一道简单但我不懂的题...
Do you know him well?
—Sure. We__________ friends since ten years ago.
A. were B. have been
C. have become D. have made
解答:
B. have been since 要用完成时的become是瞬间动词 不选 D. have made因该是 make friends with sb. 这里结构不对
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