Children’s brains cannot develop properly _________ they lack protein.
#30134
A
because
B
since
C
when
D
unless
推荐题目
It’s much easier to make friends____ you have similar interests.
#30948
A
unless
B
when
C
even though
D
so that
You can't camp________you like these days. Many natural areas are now under protection.
#31719
A
whichever
B
wherever
C
what
D
when
（2014年(春)重庆市高三考前冲刺测试卷）9. A great person believes one's real value first lies in to __ degree and sense he sets himself.
#30019
A
whose
B
where
C
how
D
what
Whether ways will be found to stop pullution or not is just ________ worries the public.
#30314
A
why
B
which
C
that
D
what
John thought it wouldn’t be long _____ he was ready for his new job.
#31646
A
since
B
when
C
before
D
after