Thanks to scientific research, we now have a good understanding of ______ an earthquake is and why it happens.A．howB．whichC．whetherD．what-高中英语-n多题

◎ 题干

Thanks to scientific research, we now have a good understanding of ______ an earthquake is and why it happens.

A．how

B．which

C．whether

D．what

◎ 答案

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◎ 解析

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◎ 知识点

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