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题目内容
（石家庄铁道大学大学英语1）
The United States is composed of fifty states,______ are separated from the others by land or water.
A、 two of which
B、 two of whom
C、 two of them
D、 two of those
A、 two of which
B、 two of whom
C、 two of them
D、 two of those
参考答案