---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：196 ℃ 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
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