Creating better health care,education and housing for everyone is a simple idea,but ____ which is hard to put into pract
问题描述：
Creating better health care,education and housing for everyone is a simple idea,but ____ which is hard to put into practice．
A．one B．that C．the one D．the other 为什么不选C呢?a simple idea 上面已经提到了呀.
答
Creating better health care,education and housing for everyone is a simple idea,but ____ which is hard to put into practice．
A．one B．that C．the one D．the other
因为这是【一个很难实施】的想法,是【泛指】.a simple idea =one,他们是同位关系.
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