The air quality in the city, ______ is shown in the report, has improved over the past two months.A. that B. it C. as D. what四个选项如何区分

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The air quality in the city, ______ is shown in the report, has improved over the past two months.A. that     B. it     C. as    D. what四个选项如何区分
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The air quality in the city, ______ is shown in the report, has improved over the past two months.A. that B. it C. as D. what四个选项如何区分
The air quality in the city, ______ is shown in the report, has improved over the past two months.
A. that B. it C. as D. what
四个选项如何区分

The air quality in the city, ______ is shown in the report, has improved over the past two months.A. that B. it C. as D. what四个选项如何区分
C
这是as 引导的非限制性定语从句,as 代替整个主句,B,D 不是关系词,而that 不可引导非限制性定语从句