Question

The book has been translated into thirty laguages since it ____ on the market in 1973.

1. A.
   has come
2. B.
   comes
3. C.
   had come
4. D.
   came

Answer 1

D
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。