In summer,Simon always keeps the window______(open）when sleeping
问题描述：
In summer,Simon always keeps the window______(open）when sleeping
答
open keep后面形容词表示一种状态
答
open
答
直接填open
这边的open是形容词 keep是系动词 系动词后面跟形容词
答
openning，这里是keep doing something。用法