问题
选择题
_____ of the swamps have become _____. [ ]
A. Any; pollute
B. Some; pollution
C. Some; polluted
D. Any; polluted
答案
答案：C
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_____ of the swamps have become _____. [ ]
A. Any; pollute
B. Some; pollution
C. Some; polluted
D. Any; polluted
答案：C