问题
选择题
In the office I never seem to have time until after 5:30 p. m., _____ many people have got home.
A whose time B. by that time
C. on which D. by which time
答案
答案：D
本题是由介词+关系代词+名词引导的定语从句。短语by that time 意思为“到那时”，用在定语从句中，要该为 by which time。
