He saw a boy _____on the truck when he g
题型:选择题
问题:
He saw a boy _____ on the truck when he got off the train. [ ]
A. played
B. to play
C. playing
D. is playing
He saw a boy _____ on the truck when he got off the train. [ ]
A. played
B. to play
C. playing
D. is playing