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I have known him （ ）two years ago1.since 2.for 3.before 4.when
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I have known him （ ）two years ago1.since 2.for 3.before 4.when
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since
不明白的再问哟,请及时采纳,多谢!
不明白的再问哟,请及时采纳,多谢!
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