12. _________ was the center of our planetary system was difficult concept to grasp in the Middle Ages. A. It was the sun and not the earth B. Being the sun and not the earth C. That the sun and not the earth D. The sun and not the earth

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题目内容（新疆师范大学2021级学生第一学期结业课程考试《大学英语》）

12. _________ was the center of our planetary system was difficult concept to grasp in the Middle Ages.
A. It was the sun and not the earth B. Being the sun and not the earth
C. That the sun and not the earth D. The sun and not the earth

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