◎ 题干
____ in1943 _____ the harmful smog made its appearance in Los Angeles.    
[     ]
A. Only; that          
B. It was;then    
C. That is was; when    
D. It was; that
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“____ in1943 _____ the harmful smog made its appearance in Los Angeles.[ ]A. Only; thatB. It was;thenC. That is was; whenD. It was; that…”主要考查了你对  【强调句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。