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