2. 专升本
  3. (2001)______more than 100 elements are known to us, only 25 of them are common and important.

(2001)______more than 100 elements are known to us, only 25 of them are common and important.

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问题 (2001)______more than 100 elements are known to us, only 25 of them are common and important.
选项 A、Although
B、If
C、Because
D、Since
答案A
解析
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