问题
选择题
It is difficult for us to learn a lesson in life ______ we've actually had that lesson.[ ]
A. when
B. after
C. since
D. until
答案
答案：D
搜题请搜索小程序“爱下问搜题”
It is difficult for us to learn a lesson in life ______ we've actually had that lesson.[ ]
A. when
B. after
C. since
D. until
答案：D