The book has been translated into thirty languages since it on the market in 1973.A. had c

问题补充：

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

A. had come

B. has come

C. came

D. comes

答案：

A. had come

B. has come

C. came

D. comes

解析：根据题意这本书已经被翻译成了三十种文字从他1973年进入市场以来，这本书是在1973年进入市场的，句子叙述的是一个发生在过去的动作，故应用过去时态，选C。