问题
选择题
— What were you doing when we were playing basketball yesterday afternoon?
— I ______ the classroom.
A．was cleaning
B．have cleaned
C．will clean
D．clean
答案
答案：A
题目分析：句意：昨天下午当我们正在打篮球时，你正在做什么？结合语境可知下文描述的是过去某时正在进行的动作，故用过去进行时态。选A。