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; thatB．a(chǎn)s; whichC．which; itD．when; as
B
考查定語從句。定從________ we have never experienced before的先行詞是such destructive earthquakes, snowstorms and tsunamis，和such連用，要用關系代詞as; 定從________ makes us worried a lot about nature disasters.的先行詞是前面整個句子，用which引導。所以選B。
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