问题: 2
By the time Martin Luther King delivered his famous speech, the blacks ___ with the white in the same classroom.
选项:
a、had never before studied
b、never before studied
c、couldn't have studied
d、have never before studied
解答:
a、had never before studied
谓语动作在delivered之前，要用过去完成时。
版权及免责声明
1、欢迎转载本网原创文章，转载敬请注明出处：侨谊留学（www.goesnet.org）；
2、本网转载媒体稿件旨在传播更多有益信息，并不代表同意该观点，本网不承担稿件侵权行为的连带责任；
3、在本网博客/论坛发表言论者，文责自负。
