Some people won’t realize the importance of their health _____they have lost it.
#56772
A
after
B
when
C
until
D
as
推荐题目
—____                            —They’re books.
#56277
A
Are these English books?
B
Are those English books?
C
How do you spell it?
D
What’re these in English?
Don’t stop working _____ twelve. 
#58157
A
to
B
at
C
when
D
until