it has been ;joined
since 引导的句子 主句用现在完成时 ；他是过去参军的,而且参军是非延续动词 所以用过去时 joined
1.He has been in the army for three years?_____ _____three years since he _____the army.
1.He has been in the army for three years?_____ _____three years since he _____the army.
英语人气：584 ℃时间：2019-09-09 05:34:13
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