(2013·济南3月模拟)You should study the details of the policy________before you sign it.
#64043
A
in return 
B
in advance
C
at ease 
D
on purpose
推荐题目
The children ______ local accent when staying with the natives.
#65859
A
put up
B
made up
C
took up
D
picked up
Scientists have made a major ____ in cancer research. 
#83068
A
break-in
B
breakthrough
C
breakup
D
breakdown