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. A. that; that B. as; which C. which; it D. when; as
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解析：定语从句考查题。第一空因为先行词被such修饰所以关系词用as；第二空关系词which指代整个主句。 过去几年中世界范围内有如此多的地区被我们没有经历过的地震、暴风雪以及海啸袭击，这使得我们非常担忧自然灾害。