What will Canadian parents do when their children over 18 keep staying at home? What does the underlined part "focus on" mean i

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问题 What will Canadian parents do when their children over 18 keep staying at home?
What does the underlined part "focus on" mean in the last paragraph?

选项 A、焦点。
B、集中心思。
C、勤勤恳恳

答案B

解析 根据上下文推测,选B。
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