____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

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____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
____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 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
原问题中,主语需要以从句的形式出现,故需要用that引导,所以选B,而不是A.
对于补充的问题,选A、B应该都可以.动名词或动词不定式都可以做主语.

That the sun and not the earth is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
整句的主语是That the sun and not the earth is the center of our planetary syste...

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That the sun and not the earth is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
整句的主语是That the sun and not the earth is the center of our planetary system，你看清楚了吗？
而Being the sun and not the earth is the center of our planetary system 整个逻辑都是错的，出现了两个谓语。可以换成 the sun and not the earth being the center of our planetary system

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这个句子缺主语部分，只能用that-clause主语从句，A是分词结构

in the center of the ____is the National Day of China representing the center of the data. Beijing is the c______ center of China . here is a park ( ) the town.A.in center of B.of the center of C.in the center of D.at the center in the center of Moscow的中文 the Peopling of America Center是什么 In the center of town同义句 in the very center of请问very what's the center of gravity? JERUSALEM CENTER OF THE WORLD怎么样 center of in the center of和in the middle of 是in the center of 还是in the central of ____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 The ____is shining填空、 The ____is in the middle of the sea.We get theThe ____is in the middle of the sea.We get there by ship. the center of capital of.有这种说法?