has been translated into thirty languages since it ------on the market in 1973 A.before B.the book

题目

has been translated into thirty languages since it ------on the market in 1973 A.before B.the book
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

选C the book has been translated into thirty languages 是现在完成时的被动语态,但是后面since it ------on the market in 1973中注意时间in 1973用一般过去时所以选C

举一反三

已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．

查看答案

我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好

查看答案

奥巴马演讲不用看稿子.为什么中国领导演讲要看?

查看答案

想找英语初三上学期的首字母填空练习……

查看答案

英语翻译

查看答案