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从所给的四个选项中选择最佳答案ItismorethanfifteenyearsIlastheardofhim.[]A.thatB.whenC.sinceD.before

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从所给的四个选项中选择最佳答案

It is more than fifteen years ______ I last heard of him .   

[    ]

A that     B when     C since     D before

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答案:C