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The earth became so violent that it was not clear_________ the shape would last or not.
A．ifB．howC．whetherD．why
C
考查：whether常與or not 連用，句意：地球表的如此的猛烈以至于地球的形狀是否會(huì)持續(xù)還是不持續(xù)還不清楚。故選C。
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