Galileo found it difficult to believe that the sun rotated around the earth and the earth______the center of the universe.

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问题 Galileo found it difficult to believe that the sun rotated around the earth and the earth______the center of the universe.

选项 A、to be
B、is
C、was
D、would be

答案C

解析 believe后跟两个that从句,第二句用was与第一句用rotated同理。
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