怎能选A呢? 正确答案应是B remember you后省略了that,没错,但是将句子改为简单句, I still remember you _______ sweetly as a student. still表示还,所以此句应解释为我还记得你像一个学生一样甜美的唱歌. remember doing表示的是记得曾经做过的事情,所以选B
选A as a student作为插入语 you __sing_____ sweetly作为remember 的宾语从句 remember 后边省略了that I still remember that (you, as a student, ____sing___ sweetly)或者 I still remember that you sing sweetly as a student。 明白了么?