Question

【题目】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

Answer 1

【答案】C
【解析】句意：我们必须做一些事来阻止人们乱扔垃圾。stop sb from doing sth阻止某人做某事。throw sth about/around/round乱扔某物，about是副词。故选C。