问题

依次填入下列各句横线处的成语，最恰当的一组是（）①作为工厂里的技术骨干，在工作中他总是冲锋在前，时时处处，亲力亲为。用实际行动践行了共产党员的职责。②不管美国如何、挖空心思挑起中国同其他东南亚国家的地缘争端，这都改变不了南海是中国固有领土的事实。③面对社会的巨变，他地寻求乡村文学的出路，力求变化创新，用文字抒发个体身处社会复杂元素中的焦虑感情。

A:处心积虑苦心孤诣殚精竭虑
B:处心积虑殚精竭虑苦心孤诣
C:殚精竭虑处心积虑苦心孤诣
D:苦心孤诣殚精竭虑处心积虑

正确答案是：

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