问题补充：
Our classroom by us every day!
A. is cleaning
B. has cleaned
C. must clean
D. is cleaned
答案：
A. is cleaning
B. has cleaned
C. must clean
(答案→)D. is cleaned
解析：
试题分析: 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。
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