In the past few years, so many areas throughout the world have been hit by such destructive earthqua

In the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ________ we have never experienced before, ________ makes us worried a lot about nature disasters.

A.that; that

B.as; which

C.which; it

D.when; as

答案及解析： B

考查定语从句。定从________ we have never experienced before的先行词是such destructive earthquakes, snowstorms and tsunamis，和such连用，要用关系代词as; 定从________ makes us worried a lot about nature disasters.的先行词是前面整个句子，用which引导。所以选B。