作业帮 > 英语 > 作业

Mary ___on her new priject late last night ,so she felt slee

来源:学生作业帮 编辑:神马作文网作业帮 分类:英语作业 时间:2024/11/11 10:25:47
Mary ___on her new priject late last night ,so she felt sleeply in the office this morning
a.must work b.must have been working c.must be working d.must have been worked
选什么.
Mary ___on her new priject late last night ,so she felt slee
嗯,是选B,因为昨晚的事儿,属于过去式,这句话意思是,他一定做完工作的很晚,所以今天早上困.也就是说对过去进行推测,而对过去的推测固定用法就是,must have done,所以不是B,就是D,但是D表示被动,不能翻译成被工作,明白了么.