____is the center of our planetary system was a difficult co

来源：学生作业帮编辑：灵鹊做题网作业帮分类：英语作业时间：2024/05/14 03:45:49

____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！

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.

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