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根据句意和本单元学过的内容,填入适当的介词或副词
After 17 years of service ________ the Emperor, Marco returned to Italy.
答案:to
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题目内容
根据句意和本单元学过的内容,填入适当的介词或副词
After 17 years of service ________ the Emperor, Marco returned to Italy.