商户的退货优惠费率在（）进行维护
A.网银签约时
B.柜台网关签约时
C.BNMS端
D.柜台CSPA签约时
参考答案：B
When _________a career, you should consider all the aspects of a job.
A．choose
B．choosing
C．chose
D．chosen
热缩
