They spent half an hour (pack)their bags 用适当形式填空 过去完成时
题目
They spent half an hour (pack)their bags 用适当形式填空 过去完成时
答案
They spent half an hour packing their bags.
spend time (in) doing sth 是固定结构（in往往省略）,这里不用过去完成时.
过去完成时用来表示“在过去的某个动作之前已完成的动作,也就是”过去的过去”.
When we arrived at the station, the train had already left.
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
热门考点