英语翻译（）has been pointed out before,air pollution is becoming more _英语解答

英语翻译
（）has been pointed out before,air pollution is becoming more and more serious in large cities.
A that
B what
C which
D as.
为什么选它?

人气：402 ℃　时间：2019-10-19 04:27:54

解答

D
A和B引导的是主语从句,明显与句子结构不符合
C和D基本可以互换,但是 Which在引导从句的时候不能放在句首,所以 D