【题目】The air quality in the city, ________ is shown in the report, has improved over the past two months.
A. it B. that
C. which D. as
在线课程【答案】D
【解析】
考查非限定性定语从句。句意：正如报道显示的那样，这个城市的空气质量在过去两个月大有改善。此处为非限定性定语从句，关系词指代The air quality in the city has improved over the past two months在从句中作主语，表示“正如……那样”，故D项正确。