I from Barbara that you and her sister have each other for over two years. [ ] A
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![I from Barbara that you and her sister have each other for over two years. [ ] A](/pic/43_748417.jpg)
I ________ from Barbara that you and her sister have ________ each other for over two years.
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A.know, known B.learn, known C.learn, learned D.know, learned试题答案
答案:B