once they find people in need,they decide on suitable ways to help them!once引导的句子不是要主将重现么?但为什么上句不加will（即they will decide on suitable ways to help them）?
问题描述：
once they find people in need,they decide on suitable ways to help them!
once引导的句子不是要主将重现么?但为什么上句不加will（即they will decide on suitable ways to help them）?
答