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4.We learned from the book that the Earth ______ round.(  )
A.isB.wasC.were

分析 我们从书中学到地球是圆的.

解答 答案:A,考查系动词.句意"我们从书中学到地球是圆的."is是;was是is的过去式;were是are的过去式.根据题干We learned from the book that the Earth ______ round.可知我们从书中学到地球是圆的.真理不变的事实要用一般现在时,不必考虑前面的时态.故选A.

点评 分析句子的结构,根据句子的内容,了解一些固定用法,让后作答.

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