问题补充：
When you have borrowed a book from the library, you should keep it well, as if it were of .
A. that, yours
B. one, yours
C. that, you
D. one, you
答案：
A. that, yours
(答案→)B. one, yours
C. that, you
D. one, you
解析：原句的意思是：当你从图书馆借到一本书时，你应该好好保管它，好像它是你自己的一本书。代词one指的是与前面提到的同名的东西（书），但不是那个东西，而that指的就是前面提到的东西。Yours代指“你的书”，one of yours“你的书当中的一本”。根据句意,可知选B.
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