单选题：In the geography lesson, the teacher told the children that

题目内容：

In the geography lesson, the teacher told the children that the earth round like a ball. A．was
B．is
C．were
D．had been

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

—Where on earth do we get light and heat? —It is from the su

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