问题

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

正确答案是：

同类题型

Please give me pencil, please.

Some students even have no idea of they are studying, so they waste much time playing.

下列有关内容的解说，正确的一项是（）

____ team wins on Saturdaywill go through to the national championships.

Could you please_____ the piano so loudly Your brother is having a rest now.