TThe other day,my brother drovehis carThe other day,my brother drove his car down the street at ____ thought was a dangerous speed.为什么不能用which 而用what

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TThe other day,my brother drovehis carThe other day,my brother drove his car down the street at ____ thought was a dangerous speed.为什么不能用which 而用what

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

TThe other day,my brother drovehis carThe other day,my brother drove his car down the street at ____ thought was a dangerous speed.为什么不能用which 而用what
原因很好理解,at后面的是个宾语从句,且从句中缺少主语.which做主语时是在定语从句中,且前面要有先行词.
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what 不能跟在at 后面
at which 等于that 引导后面的句子