The other day,my brother drovehis car down the street at ____ I thought was a dangerous speed.为什么不能用which而用what?

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The other day,my brother drovehis car down the street at ____ I thought was a dangerous speed.为什么不能用which而用what?

首先这里应该填what
假设填的是which,那么at which引导的是定语从句,先行词是street,那从句就成了“我觉得这条街是个很危险的速度.” 句子意思不同,故不能用which
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