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(gè)月后這個(gè)年輕人才掌握了操作這臺(tái)從德國(guó)引進(jìn)的機(jī)器的技巧。It was+時(shí)間段+before. . . 多長(zhǎng)時(shí)間后才……。

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