You should study the details of the policy before you sign it.
A. in return
B. in advance
C. at ease
D. on purpose
网友回答
A. in return
B. in advance
C. at ease
D. on purpose
解析：A．in return做为回报，B．in advance提前，C．at ease轻松，D．on purpose目的，句意：在你签字前，你应该提前学习政策的细节。所以选B。