This mathematic problem was so difficult that no student and no teacher ______ a

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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．．and each．．．，every．．．and every．．.,many a．．．and many a．．．和no．．．and no．．．这样的结构之后，谓语动词应该用单数形式。

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