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    Thanks to scientific research, we now have a good understanding of ______ an earthquake is and why it happens.
    A．howB．whichC．whetherD．what
    D

    试题分析：经分析，of是介词，后接宾语从句，而is是系动词，后接表语，故应选D。本句含义，多亏了科学研究，现在我们对什么是地震以及为什么发生地震有了很好的了解。
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