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Beijing has struggled with smog for years，which has__________ the sun and affected the health and quality of life of millions.
A．driven awayB．pushed outC．broken offD．blocked off
D               
             
試題分析：考查動詞短語辨析。A．driven away開走；B．pushed out開除；C．broken off中斷；D．blocked off阻擋。句意：北京這些年來一起受霧霾影響，阻擋陽光，影響人們的健康與生活質量。Which代指smog，霧霾阻擋陽光，所以選D項。          
考點 : 考查動詞短語辨析
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