Zhengzhou was attacked by such a terrible sandstorm few residents had ever experienced be

问题补充：

Zhengzhou was attacked by such a terrible sandstorm few residents had ever experienced before.

A. which

B. as

C. where

D. that

答案：

A. which

(答案→)B. as

C. where

D. that

解析：

试题分析:考查as 引导的定语从句。句意：郑州遭遇了如此可怕的沙尘暴，这样的沙尘暴是很少居民以前曾经历过的。此题很容易错选成D 选项，认为是such …that 句型，但是在such…that 中that从句应该句子完整不少成分，但此句中experienced 缺少宾语。所以判断为定语从句，因先行词sandstorm 前有such 修饰，所以定语从句应由as 引导，故B为正确选项。