2. 外语
  3. This mathematic problem was so difficult that no student and no teacher_________ able to solve it.

This mathematic problem was so difficult that no student and no teacher_________ able to solve it.

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问题 This mathematic problem was so difficult that no student and no teacher_________ able to solve it.
选项 A、were
B、is
C、was
D、are
答案C
解析
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