Don’t throw litter around. Please.A. pick it upB. pick up itC. pick up themD. pick them up

问题补充：

Don’t throw litter around. Please.

A. pick it up

B. pick up it

C. pick up them

D. pick them up

答案：

(答案→)A. pick it up

B. pick up it

C. pick up them

D. pick them up

解析：本题的含义是不要乱扔垃圾，请把它捡起来，pick sth up表示把某物捡起来，sth为代词必须放在两者之间，前句使用litter，故用it来代替，故本题选A。