They like( )the dolphin( )balls.

问题描述:

They like( )the dolphin( )balls.
A watch,play with
B watching,play
C to watch,playing with
D watching,playing with

D
因为like有2种用法
(1)like to do(特指sth)
(2)like doing
而这里用第(2)种.
watch表示注视,后接doing.ball前要加with