Remember that you won't be able to cancel the contract you've signed. A. before
来源：网络
时间：
推荐文章
Remember that you won't be able to cancel the contract ____you've signed.
A. before B. until C. once D. though
试题答案
C
解析:
句意:一旦签署了合同,你一定记住不能撤消。once用作从属连词，表示 “一旦……就……。