____ can be seen in the chart right here, the air pollution level in the city has been increasing over the last months.
A．WhatB．ItC．thatD．As
D

試題分析： 考查as引導非限制性定語從句。題意 正如我們所看到的，空氣污染水平在上月一直在增長。As代指 the air pollution level in the city has been increasing over the last months，故選 D項。
考點 非限制性定語從句。
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