问题
选择题
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
答案：C
考查名词性从句。介词at后为宾语从句，I thought为插入语，从句中缺少主语，所以用what，故选C。
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