That hazy（霧霾）weather has hit 104 cities in middle-east China lately makes citizens well aware of
______a terrible problem China is faced with.
A．whatB．howC．whichD．that
A

試題分析：句意：最近席卷中國東部104個城市的霧霾天氣使公民意識到中國面臨一個多么嚴重的問題啊。Of后面是賓語從句，賓語從句用感嘆句，修飾a terrible problem用what，選A。
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