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题目
题型:不详难度:来源:
Tom had been studying French hard for nearly three years    he mastered it.
A.afterB.when C.since D.before

答案
D
解析

试题分析:句意:——汤姆努力学了将近三年后才精通了法语。A在……之后;B当……时;C自从;D在……之前。根据前后句时态可知“学习法语”发生在“掌握法语”之前,所以用before,答案选D。
核心考点
试题【Tom had been studying French hard for nearly three years    he mastered it.A.aft】;主要考察你对连词等知识点的理解。[详细]
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