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

题目简介

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

题目详情

By the time these books were published,  he _____ addicted to them.
A.had becomeB.becomesC.has becomeD.became
题型:单选题难度:偏易来源:不详

答案

A
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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