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填空题
Ms Clark came to Beijing three years ago.→ It has been ____ Ms Clark came to Beijing.
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解析：
本题为时态转换题。原句用的是一般过去时，而转换句用的是完成时态且用it作形式主语，因此将原句中的时间状语作转换句表语。而用连词since引导原句谓语动词使之变成转换句中的时间状语从句。注意，进行这种转换时，原句中的ago、before等不能再保留。
本题为时态转换题。原句用的是一般过去时，而转换句用的是完成时态且用it作形式主语，因此将原句中的时间状语作转换句表语。而用连词since引导原句谓语动词使之变成转换句中的时间状语从句。注意，进行这种转换时，原句中的ago、before等不能再保留。
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