问题
选择题
He drove slowly on the way home until he reached the highway, _____ the speed limit was 60 miles per hour.
A．because
B．which
C．where
D．that
答案
答案：C
先行词是highway表示地点，定语从句中不缺主语和标语，故用关系副词在从句中作地点状语。
【标签】定语从句关系副词