题目内容

____ can be seen in the chart right here, the air pollution level in the city has been increasing over the last months.

A.What B.It C.that D.As

D

解析试题分析: 考查as引导非限制性定语从句。题意 正如我们所看到的,空气污染水平在上月一直在增长。As代指 the air pollution level in the city has been increasing over the last months,故选 D项。
考点 非限制性定语从句。

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