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
_________ many countries in Latin America have been trying to reduce gaps in income, America has allowed inequality to grow.
#32971
A
While
B
Since
C
If
D
Where
I invited him to go to the cinema with me and he promised to. He didn’t,______.
#33370
A
too
B
therefore
C
though
D
either
