____is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

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• ____is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
• 一个英语语法选择题_____is the center of our planetary system was a difficult concept to grasp in the Middle Ages.A.It is the sun and not the earthB.Being the sun and not the earthC.The sun and not the earthD.That the sun and not the earth为什么?D为什么不可以呢不太明白啊，如果it是做形式主语的话，那么it is the sun and not the earth这句句子 和后面地is the center of our planetary system 是怎么回事啊？如果它是后面一句的主语吗？(=@__@=) 以前好像老师说过，只有从句如 what 之类的引领的句子才能作为其他人句子的主语。如果it is 是强调的话，那不就出现多个谓语了吗？
• ______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.答案是That the sun and not the earth.为什么Being the sun and not the earth.不可以呢不是非谓语吗,可以做为主语从句中的主语部分啊
• ________ was the center of our planetary system was a difficult concept to grasp in the Middle Ages.A.It was the sun and not the earth B.Being the sun and not the earthC.That the sun not the earth D.The sun and not the earth
• ____is the center of our planetary system was a difficult concept to grasp in the Middle Ages.A Being the sun and not the earth B That the sun and not the earth真正的答案是选B 我想问一下：动词不定式 和 名词性从句作主语 在这道题上有什么区别呢?为什么A 不行?那如果说 这道题改成____is the center of our planetary system AB 两项 都可以么？动词ing形式做主语也可以啊！
• ______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.
• ________ was the center of our planetary system was a difficult concept to grasp in the Middle Ages.
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