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题目
题型:不详难度:来源:
By the time these books were published,  he _____ addicted to them.
A.had becomeB.becomesC.has becomeD.became

答案
A
解析
考察时态.根据时间状语,到这些书出版时,可知主句动作在过去已经完成,故用过去完成时态,选A.
核心考点
试题【By the time these books were published,  he _____ addicted to them.A.had becomeB】;主要考察你对一般现在时等知识点的理解。[详细]
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