问题

It is difficult for us to learn a lesson in life_________we’ve actually had that lesson
A:until
B:after
C:since
D:when
B:after
C:since
D:when
正确答案是:
同类题型
_________ is the centre of the city from here—- It’s_________.
______I open my mouth, I put my food in it.
We have to _____ the wheat as soon as possible because a storm is on the way.
The last one _____ pays the meal. —Agreed!
What do you often do _______ your freetime — I often read. I read __________interesting books .