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The other day,my brother drove his car down the street at___

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The other day,my brother drove his car down the street at________ I thought was a dangerous speed.
A.as
B.which
C.what
D.that
答案C
题干的介词at后为一宾语从句,该宾语从句的主语是一主语从句,连接代词what既引导主语从句,又在从句中作thought的宾语.连词that虽然也能引导主语从句,但它不能在从句中充当成分,故答案为C.