问题
选择题
Kids have fun ________ with water by the sea. [ ]
A. playing
B. to play
C. play
D. played
答案
答案：A
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Kids have fun ________ with water by the sea. [ ]
A. playing
B. to play
C. play
D. played
答案：A
先后射入电场中，最后分别打在正极板A、B、C 处，则：（ ） 
