问题补充：
We must keep the classroom .
A. clean
B. to clean
C. cleaning
D. cleaned
答案：
(答案→)A. clean
B. to clean
C. cleaning
D. cleaned
解析：本题的含义是我们必须要使教室保持干净，keep sth+形容词表示使某物保持某个状态，clean可以为形容词，故本题选A。
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