单项选择题

A man escaped from the prison last night. It is a long time（）the guards discovered what had happened.

A. before
B. until
C. since
D. when

<上一题目录下一题>

热门试题

单项选择题

Mr. Johnson preferred（）heavier work to do.

A. to be given
B. to be giving
C. to have given
D. having given

相关试题