Their business came from a few big publishers, all of whose books they bound.
他们的生意来自几家大出版社，这些出版社所有的书都由其装订。
《柯林斯英汉双解大词典》
Whose books are these on the desk?
桌上的书是谁的？
youdao
Whose books are these?
这些书是谁的?。
What's all this? Whose books are these, yours?
这些都是什么呢？这些是谁的书，你的吗？
Whose books are those?
那些书是谁的？
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