Studying in groups is necessary_____ you want to do well in school.
#30854
A
if
B
until
C
unless
D
though
推荐题目
How did you manage to get to school on time ______ you missed the school bus?
#79910
A
when
B
if
C
once
D
because
---Could you please give the dictionary to Wang Feng?---Yes, of course! I’ll give it to him ________ he comes back.
#29946
A
since
B
before
C
as soon as
D
until
Don’t turn off the computer before closing all programs, _________ you could have problems.
#30878
A
or
B
and
C
but
D
so