---they have found someone in trouble,they decide on suitable way_其他解答

---they have found someone in trouble,they decide on suitable ways to help them.
A If B Once C Because D Since
如何区分A\B两个答案?

人气：487 ℃　时间：2019-08-22 08:22:57

解答

B吧
A是虚拟,虚拟条件句时态要比结果句时态过去一个等级
如果A后面应该是will decide
而且have found暗示是once