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为什么?请详细说明,分析每个选项,

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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为什么?请详细说明,分析每个选项,

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为什么?请详细说明,分析每个选项,
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
为什么?
请详细说明,分析每个选项,

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为什么?请详细说明,分析每个选项,
显然后面是一个从句,throught后面的句子缺少主语,所以前面的空要填可以充当主语的词,所以排除A和B,而因为前面有一个at,所以不能加that,要加what

at ....speed 是短语以什么什么的速度
而what 引导从句修饰speed