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The book has been translated into thirty language since it _

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The book has been translated into thirty language since it _____on the market in 1973.a.had come b
The book has been translated into thirty language since it _____on the market in 1973.
a.had come b.has come c.came d.comes
为什么不用was came,如果把has been改成had been,后面该怎么填?
选C
因为come on 是不及物动词短语,没有被动语态,又因时间状语in 1973表示过去具体发生的动作,所以用一般过去时