还有两道题,只是不知道为什么要这么选,麻烦告诉我一下理由及语法知识
1.Sony,Panasonic and Toshiba are three big (businesses) in the world.Their (business) started growing in 1960s.(理由,前一格我知道,但后面一格翻译是他们的企业,应是复数,为什么要这么填?)2.She comes to see me (once) two weeks.(一次：once,我知道,只是在这句话中为何不能用each 与every)