Mr Zhang gave all the textbooks to all the pupils , except who had already taken them .A.

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A. these
B. ones
(答案→)C. the ones
D. the others
解析：one本来是数词，但也可用作不定代词，代替前面刚提到的一个东西或人，避免重复前面刚提到的名词，有时one可以有自己的定语或冠词，甚至可以有复数形式，如：I don't like these pink shirts . Will you plese show me the white ones ? (我不喜欢这些粉色的衬衣，请您把那些白色的衬衣拿给我看看好吗？)