China has a lot of famous writers,one of -----is Lu XUn,为什么不能用them
问题描述：
China has a lot of famous writers,one of -----is Lu XUn,为什么不能用them
答
填whom,因为这是个复合句,后面的是定语从句,只是这里的引导词前面有one of 修饰.
如果反句子改为两个单句,还是可以用them的:
China has a lot of famous writers.One of them is Lu Xun.