Question

What were you doing ________ last Sunday morning? A．at B．in C．Over D．

What were you doing ________ last Sunday morning? A．at B．in C．Over D．/

Answer 1

D
试题分析：句意:上个星期天的早上你在做什么？at
通常用来表示具体时刻；in
表示泛指在早上、下午或晚上；over
表示在…期间。last
Sunday
morning
，上个星期天，前面不用介词。故选D。