It is difficult for us to learn a lesson in life ______ we’ve actually had that lesson.
#30782
A
until
B
after
C
since
D
when
推荐题目
You can’t borrow books from the school library ______ you get your student card.
#80553
A
before
B
if
C
while
D
as
They had just finished the work _______ there was another one waiting for them.
#31462
A
while
B
when
C
as
D
since
