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10 questions
听不听
选出“不”的读音
bù
bú
bu
不安
bū
bŭ
教授不得不承认高斯是一个数学天才
bÚ , bÙ
bÙ , bú
bú , bú
bù , bù
我们不要轻易放弃,我相信不久的将来,我们一定会成功的
bú bú
bú bu
bú bù
bù bù
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