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 题目和参考答案——青夏教育精英家教网—

____ 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

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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