热镀锌槽钢多少钱一吨:一道英语题

来源:百度文库 编辑:神马品牌网 时间:2024/07/08 18:00:15
Jim has been in the factory for two years ( )he left school .
a.when b.since c.as soon as d.whether

b因为完成时中用since引导时间点的从句

B

b~~~~~~~~~~~~~`