The book has been translated into thirty laguages since it ____ on the market in 1973.
A.has e
B.es
C.had e
D.came
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D解析试题分析：根据since引导的从句的时间状语in 1973，这是过去的时间，所以用一般过去式，故选D。考点：考查动词时态的用法。点评：本题难度适中。动词时态的考查与一定的语境结合一起增加了试题的难度，有的考生时态的用法背的很熟，但在不同的语境下，就做不对了，提醒考生一定要会分析理解语境。即学即练：---Has Li Lei finished his work today?--- I have no idea, but he ______ it when I saw him this morning.
A. had done
B. would do
C. was doing
D. did解析：C。句意：：--今天李雷完成他的工作了吗？----我不知道，但我今早看到他时他在工作。根据句意及时间状语when I saw him this morning可知用过去进行时。