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The book has been translated into thirty languages since it ______ on the market in 1973.
A．had comeB．has comeC．cameD．comes
C

試題分析：考查時(shí)態(tài)：since后面的時(shí)態(tài)是過去時(shí)，主句是現(xiàn)在完成時(shí)，句意：自從1973年上市，這本書已經(jīng)被翻譯成30種語言。選C。
點(diǎn)評(píng)：時(shí)態(tài)的考查結(jié)合上下文找到動(dòng)作發(fā)生的時(shí)間就好做了。要注意一些固定用法。
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