at后面加动词ing形式。
at：prep.在(某时间或时刻);在(学习或工作地点);在(某处)。
扩展资料
The weather is very changeable at this time of year.
年年在这个时候天气都变化无常。
Almost all homes have at least one TV set.
差不多每家都至少有一台电视机。
I was still in short trousers at the time.
我那时还在穿着短裤呢。
Both their children are at university.
他们的两个孩子都在上大学。
He met his future wife at law school.
他在法学院结识了他未来的妻子。
