一英语语法题.____is the center of our planetary system was conside

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一英语语法题
.
____is the center of our planetary system was considered as heresy by the church
in the Middle Ages.
A.It is the sun and not the earth
B.Being the sun and not the earth
C.The sun and not the earth
D.That the sun and not the earth
为什么选D,其他选项哪里不对了?

先断句看句子结构,was considered as是谓语,heresy是宾语,by the church in the Middle Ages是宾语补足语,由此来看前面的部分是主语,因此用that引导的主语从句.
通常一个句子只有一套主干,一个谓语,A选项和C选项中都出现了谓语动词加上主句中的谓语成分就成了两个谓语,这样的句子是不对的.
至于B选项being和is也是不能出现在同一个句子中的.
再问：现在分词的主语从句也没错啊？还有C选项不能同时出现Is和was？
再答：现在分词也可以引导主语从句，如果有现在分词的话后面就不应该出现is。 C选项跟D选项的区别就是一个有that，一个没有，that引导主语从句时不能省略，引导宾语从句有时可以省略。C选项中省略了that还是出现了一个句子中有两套主干两个谓语的情况。
再问：现在分词后面为么不该出现IS啊，麻烦详细讲下啊，谢谢
再答： being 和is 都是be动词的变化形式，一般情况下being 和is不会出现在一个主语从句中。像这个句子中Being a volunteer is great。情况就不同了，这是Being和is出现在一个句子中的情况。建议你看下现在分词的用法，还有什么问题的话欢迎追问。
再问： Being a volunteer is great为什么就可以了呢？不也出现两个be动词了么
再答：这一句是一个完整的句子，being a volunteer做的是主语。而上面的那个句子前半部分只是个从句，从句里面出现了两个be动词的变形，句子后面真正的谓语was又是一个，那么这整个句子里出现了三个。你可以参考下这里面being的用法，希望对你的理解有所帮助。

一个英语语法选择题_____is the center of our planetary system was a di ____the center of our planetary system was considered as ________ was the center of our planetary system was a diffic 1._______ is the center of our planetary system was a diffic 英语试题1._______ is the center of our planetary system was a di 英语习题,大侠进1._______ is the center of our planetary system was 英语语法The price of the houses in our city is ______ as it was 英语翻译Our description of the (preferred) development of system 英语翻译The sunThe sun lies at t he center of solar system,a ver THE teacher thought little of the matter beacause be conside The development of the standardized sizing system was a mile 英语翻译Changes in the fair value of contingent purchase conside