Creating world peace is a rather difficult goal,____calls fo

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Creating world peace is a rather difficult goal,____calls for efforts of many generations.
A.one that B.once C.that D.it
请问选哪个?为什么、请详细说明不对的三个选项.

选A 逗号后面的部分是一个非限制性定语从句,可以直接用which（非限制性定语从句引导词缺主语用which不用that）,要不就用one that,其中one是先行词,that是引导词,和前面的从句构成一个同位语的关系（B不能做主语,用作状语,C不用于非限制性定语从句,D前面要加个连词and）
再问：你好、感谢你的回答、为什么it前一定要用and呢？我这个用法用的不好、就像Swimming is a sport, it is useful.也可以没有and吧。再次感谢！
再答：你写的句子其实也不对的，只有把it前面的改为句号it大写才可以用这个句子的，其实就是因为两个独立的句子之间要有连词，否则就要一个是主句一个是从句，或者用句号分开

-The test is rather difficult. we have p_________the whole world that China is a peace-lovi [-A1] The microscope is rather difficult __________. He is rather difficult to make friends This question is ___ more difficult than that one.A rather B this question is ()more difficult than that one.a.rather b.q This question is （）more difficult than that one.A.rather B.q Peace is the common t_____ in the world Creating a more harmonious society_____goodness is more comm Creating a more harmonious society where goodness is more co 英语翻译Creating a Harmonious CampusA harmonious campus is of vi live in a world at peace with itself 语法精分系