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

______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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