问题
选择题
| We must do something to stop people from ______. |
A. to throw litter about B. to throw litter into C. throwing litter about D. throwing litter into |
答案
答案：C
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| We must do something to stop people from ______. |
A. to throw litter about B. to throw litter into C. throwing litter about D. throwing litter into |
答案：C