______more than one hundred elements are known to us, only twenty-five of them are common and important.

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问题 ______more than one hundred elements are known to us, only twenty-five of them are common and important.

选项 A、If
B、Although
C、Because
D、Since

答案B

解析 根据句子意思,前后两句有让步关系。
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本试题收录于: 英语题库普高专升本分类
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