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

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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

解析此题考查主语从句。首先应判断出本句主句的谓语是was，其主语为一个真理性的陈述句。当句子的主语是一个陈述句时，必须由从属连词that来引导。因此D项符合题意。

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