问题
选择题
| — Why does the Lake smell terrible? — Because large quantities of water _____. |
A. have polluted B. is being polluted C. has been polluted D. have been polluted |
答案
答案：D
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| — Why does the Lake smell terrible? — Because large quantities of water _____. |
A. have polluted B. is being polluted C. has been polluted D. have been polluted |
答案：D