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_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.
A.As B.While C.BecauseD.If
B
考查连词特殊用法。While然而;结合句意可知B正确。句意:尽管地震科学家理解地震是如何为什么发生,但是预测通常是不准确的。
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