定语从句一道题：the United States is made of fifty states,one of___i

定语从句一道题：the United States is made of fifty states,one of___is separated from the other by
The United States is made of fifty states,one of___is separated from the other by the Pacific ocean.
A.them
B.those
C.which
D.whose
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要有质量的【答案】和【分析】