Question

"In the office, I never seem to have time until after 5∶30 p. m. ________, many p"

"In the office, I never seem to have time until after 5∶30 p. m. ________, many people have got home．
A. whose time
B. that
C. on which
D. by which"

Answer 1

答案D
该题考查非限制性定语从句，by which指“到那时为止”，与完成时连用;介词on后接具体日期，不接时刻。