1为什么他们不能把精力集中到功课上?Why don’t they —— —— their school work?

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1为什么他们不能把精力集中到功课上?Why don’t they —— —— their school work?
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1为什么他们不能把精力集中到功课上?Why don’t they —— —— their school work?
1
为什么他们不能把精力集中到功课上?
Why don’t they —— —— their school work?

1为什么他们不能把精力集中到功课上?Why don’t they —— —— their school work?
focus on或者concentrate on

focus on

concentrate /focus,on

focus on