2. 外语
  3. ______ is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

______ is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

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问题 ______ is the center 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 that作从属连词，无实在意义，用来引导主语从句、宾语从句、表语从句和同位语从句，如：That a liquid state is the normal state for water is a well-known fact．液态是水的常态，这是众所周知的事实。
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