Beijing was attacked by such a terrible sandstorm few citizens had ever experienced before.
A. and it was
B. as
C. that
D. which
网友回答
A. and it was
(答案→)B. as
C. that
D. which
解析：此题考查定语从句关系词的选择。由于前面有such，故选as引导的定语从句，先行词是sandstorm。试比较下面的结果状语从句：Beijing was attacked by such a terrible sandstorm that few citizens had ever experienced it before.