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This mathematic problem was so difficult that no student and no teacher_________
This mathematic problem was so difficult that no student and no teacher_________
游客
2023-11-23
55
管理
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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