The teacher told his students that the e

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问题 The teacher told his students that the earth ____ round like a ball.(  )A. be B. is C. had been D. was

选项 A. be
B. is
C. had been
D. was

答案 B

解析 句意:老师告诉学生,地球是圆的,就像一个球。“地球是圆的”是一个客观真理,已被科学证实,所以此处应该用be的一般现在时“is”。
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