题目内容

_____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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