题目

—There must be a dozen paper clips in these drawers but I can’t find one when I need one. —Keep looking            .is sure to turn up. A.One                 B.It                  C.That              D.This   答案： A   one为代词，代指想找的one of the paper clips,为不特定的一个，而it/that/this均指代前文出现的同一事物。  

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