23. The air quality in the city, is shown in the report, has improved over the past two months.(A) t

問題詳情

23. 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

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)