天津虹桥医院:He studied at the high schllo ___he joined the army.
来源:百度文库 编辑:高校问答 时间:2024/05/23 23:30:45
A after B before C when D since
选B把,在加入军队之前
C when
看前后两句话时态一样
AB排除
D用完成时
好象是B吧
joined the army是参军的意思,所以在参军前 他在高中上学
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