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      1. 微信刷題,考證常用
        • 試題題型【單項選擇題】
        試題內容
        ____ the age of six, he began to play the piano.
        • A. in
        • B. at
        • C. by
        • D. on
        • 參考答案:B
        • 解題思路:at the age of +年齡,固定搭配
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