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

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

出自：石家庄铁道大学-土木工程-大学英语III

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