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2 narrow sth down

The American Academy of Sleep Medicine offers a number of reasons that may be causing your particular variant of hypnagogic jerks. Unfortunately, the spectrum of explanations is so broad that it really doesn't help narrow down much at all.这句话最后的much是做narrow的宾语还是修饰at all?

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最佳答案 20小时前

much 这里是副词，做状语表示程度修饰narrow down. at all是和前面的doesn't 相呼应。

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擅长：英语 | 采纳率 54% | 回答于 1天前

2 narrow sth down

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