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 It was two months _______ the young man mastered the skill of running the machine introduced from Germany.

A. since                 B. when                C. that                 D. before

解析：選D。句意：兩個月后這個年輕人才掌握了操作這臺從德國引進的機器的技巧。It was+時間段+before. . . 多長時間后才……。

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