问题描述：
一道单词拼写题
Nowadays cats are no longer good at c_______ mice；they'd rather be people's pets
(这里是catching 还是chasing)
什么时候用catch，什么时候用chase
Nowadays cats are no longer good at c_______ mice；they'd rather be people's pets
(这里是catching 还是chasing)
什么时候用catch，什么时候用chase
问题解答：
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