2. 考研
  3. ________is the centre of our planetary system was a difficult concept to grasp in the Middle Ages.

________is the centre of our planetary system was a difficult concept to grasp in the Middle Ages.

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问题 ________is the centre of our planetary system was a difficult concept to grasp in the Middle Ages.
选项 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
答案D
解析 本题考查主语从句。分析句子结构可知，谓语是was，宾语是a difficult concept，主语为was前的部分。主语内包含一个完整的句子，所以需要用连词来连接两个完整的句子，that可以引导主语从句，D项放在句中能够满足语法结构，故为答案。
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