问题描述：
3、all,both （1）___ of my parents work in the hospital （2）there are many boys under
the big tree.____ of them are playing games
（3）his legs were___ injured(受伤) in the traffic accident(交通事故)
the big tree.____ of them are playing games
（3）his legs were___ injured(受伤) in the traffic accident(交通事故)
问题解答：
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