一般制冷系统要求每()小时巡检一次。A.2 B.3 C.4 D.6 发布时间:2019-11-02 23:56 │ 来源:www.tikuol.com 题型:单项选择题 问题: 一般制冷系统要求每()小时巡检一次。A.2B.3C.4D.6
题型:单项选择题 Maria asked Jim, "Are you working hard at geography now?" Maria asked Jim ______ he ______ working hard at geography then.A. if, wasB. that, was C. /, is D. whether, is 查看答案