一What do you usually do when you see oth
问题:
一What do you usually do when you see others ________?
一I usually stop them and ________. [ ]
A. litter; pick it up
B. littering; pick up it
C. litter; pick it
D. littering; pick it up
一What do you usually do when you see others ________?
一I usually stop them and ________. [ ]
A. litter; pick it up
B. littering; pick up it
C. litter; pick it
D. littering; pick it up