题目内容
【题目】Tom had been studying French hard for nearly three years he mastered it.
A. after B. when C. since D. before
【答案】D
【解析】句意：汤姆学了接近三年的法语才掌握了它。考查时间状语从句。此处表达在他掌握这门语言之前学习了接近三年的时间，应该是before引导的时间状语从句。
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题目内容
【题目】Tom had been studying French hard for nearly three years he mastered it.
A. after B. when C. since D. before
【答案】D
【解析】句意：汤姆学了接近三年的法语才掌握了它。考查时间状语从句。此处表达在他掌握这门语言之前学习了接近三年的时间，应该是before引导的时间状语从句。
