问题
选择题
Our classroom _______ by us every day!
A．is cleaning
B．has cleaned
C．must clean
D．is cleaned
答案
答案：D
题目分析: 句意：我们的教室每天由我们来打扫！.is cleaning正在打扫，has cleaned 已经打扫，must clean 必须打扫，is cleaned被打扫。根据by us由我们，可知为被动语态，故选D。