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A
考查时态和固定短语。focus on sth.“把注意力(焦点)集中在......”。句意“最近的因爆炸引起的风波已经把公众的注意力集中在了这一地区。”复数在过去的事情,对现在造成的影响,用现在完成时。故选A。
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