By the time these books were published,  he _____ addicted to them.
A．had becomeB．becomesC．has becomeD．became
A
考察時(shí)態(tài).根據(jù)時(shí)間狀語(yǔ),到這些書(shū)出版時(shí),可知主句動(dòng)作在過(guò)去已經(jīng)完成,故用過(guò)去完成時(shí)態(tài),選A.
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