问题
选择题
The children _____ the windows already, so the classroom looks much brighter.[ ]
A. are cleaned
B. will clean
C. are cleaning
D. have cleaned
答案
答案：D
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The children _____ the windows already, so the classroom looks much brighter.[ ]
A. are cleaned
B. will clean
C. are cleaning
D. have cleaned
答案：D