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题目
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Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.                         
A.facingB.facedC.being facedD.having faced

答案
A
解析
考查非谓语动词。句中facing technology in the 21st century作定语,修饰名词problems,之间为主动关系,故选A。
核心考点
试题【Some English scientists are identifying problems ____ technology in the 21st cen】;主要考察你对现在分词等知识点的理解。[详细]
举一反三

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