Our teacher said people used to say the earth _____(be)not round

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Our teacher said people used to say the earth _____(be)not round
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Our teacher said people used to say the earth _____(be)not round
Our teacher said people used to say the earth _____(be)not round

Our teacher said people used to say the earth _____(be)not round
Our teacher said people used to say the earth ___was__(be)not round
我们老师说人们过去说地球不是圆的.

is 用一般现在时,因为从句是自然现象或客观真理。

is.........

was
用be动词的过去式
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was
注意,当主句动词为过去时时,从句也相应地用过去时的某一种时态,在这里,空格所在的句子的上级句子用了used to,这个情态动词表示过去,所以空格所在的句子也要用过去时,用了was。希望我能帮助你解疑释惑。