整个句子叙述的是一般事实,所以使用一般现在时,which they used 是which引导的定语从句,修饰tools,可以更换过去式,表示以前使用过.they are looking 表示寻找食物的过程,不表示现在进行时的意思.
they design tools with hooks which they used when they are l
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