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  3. (That) the sun (but) not the earth (is) the center of our planetary system (was) a difficult concept to grasp in the Middle Ages

(That) the sun (but) not the earth (is) the center of our planetary system (was) a difficult concept to grasp in the Middle Ages

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问题 (That) the sun (but) not the earth (is) the center of our planetary system (was) a difficult concept to grasp in the Middle Ages.
选项 A、That
B、but
C、is
D、was
答案B
解析 but多余。but通常连接一个句子表示转折，或用在nothing but，not...but结构中。
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