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
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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