In the Middle Ages people believed it was the earth, not the sun, ______ the cen

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问题 In the Middle Ages people believed it was the earth, not the sun, ______ the center of our planetary system.

选项 A、was that
B、that was
C、was
D、that

答案 B

解析该题考查考生对强调句的掌握。在该句中，it was...是强调句，因此主句应该用that引导的句子。例如：It was the very hospital that she was born in．这就是她出生的医院。

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