A lot of people don’t learn from their mistakes ______ they get hurt. 
#31476
A
whether
B
when
C
if
D
unless
推荐题目
_____ many times, but he still didn’t know what to do next.
#34158
A
Having been told
B
Although he had been told
C
He had been told
D
Having told
Why not stay at home ______ the road is so slippery after the heavy snow?
#31389
A
so long as
B
in case
C
so far as
D
now that