______ we know, the air quality in the city has improved over the past two years.
A．ThatB．AsC．WhatD．It
B

試題分析：句意：正如我們知道，這個城市的空氣質(zhì)量在過去的兩年間有了改善。As。正如；類似的表達還可以是：What we know is that the air quality in the city has improved over the past two years. 或者 It is known that the air quality in the city has improved over the past two years. 故選B。
考點: 考查代詞的用法。
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