问题
选择题
Last night on my way home I saw an old lady driving a BMW car at __________I thought was a dangerous speed.
A．that
B．which
C．what
D．how
答案
答案：C
题目分析：考查名词性从句。从句中缺少主语，故用关系词what。句意：昨天晚上在我回家的路上，我看到一位老太太开了一辆宝马车，我认为是非常危险的速度。故C正确。