问题
选择题
____ for months, the room is very dirty. [ ]
A. We don't clean it
B. Having not cleaned
C. Not having been cleaned
D. Having not been cleaned
答案
答案：C
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____ for months, the room is very dirty. [ ]
A. We don't clean it
B. Having not cleaned
C. Not having been cleaned
D. Having not been cleaned
答案：C