题目内容
【题目】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
【解析】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.
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题目内容
【题目】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
【解析】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.