问题补充:
Professor Zhang handed out the textbooks to all the students,except who had already taken them.
A. these
B. ones
C. the ones
D. the others
答案:
A. these
B. ones
(答案→)C. the ones
D. the others
解析:考查代词的用法。who had already taken them是定语从句,修饰空格处的代词,由此可判断选C,the ones相当于those。