______ 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

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______ 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
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______ 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
______ 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

______ 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
动名词才可以作主语

第一个是主语从句,肯定可以作主语,第二个是一个系表结构怎么可以作主语呢