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
They like( )the dolphin( )balls.
They like( )the dolphin( )balls.
A watch,play with
B watching,play
C to watch,playing with
D watching,playing with
A watch,play with
B watching,play
C to watch,playing with
D watching,playing with
英语人气：226 ℃时间：2020-04-02 20:41:26
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