应该是began,过去式.
从那以后,人们开始了保护水源.
这句话是个过去时态,是指从那以后,人们开始了保护水源.开始保护水源发生在过去,因此用began
英语翻译原句：从那以后,人们开始了保护水源.A）Since then,people begin to care abou
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