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:石家庄铁道大学大学英语1

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块