they are some difficult math problems.改为单数句 ---- ---- diffic

学习 时间:2026-04-07 17:07:35 阅读:6204
they are some difficult math problems.改为单数句 ____ ____ difficult math problems.

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典雅的小土豆

威武的犀牛

2026-04-07 17:07:35

There's a difficult math problem。

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