By the time these books were published, he addicted to them.A. had becomeB. becomesC. has

发布时间：2020-08-16 17:16:20

By the time these books were published,  he      addicted to them.
A. had bee
B. bees
C. has bee
D. became

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(答案→)A. had bee
B. bees
C. has bee
D. became
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.
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