_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.
A．As B．While C．BecauseD．If
B
考查連詞特殊用法。While然而；結(jié)合句意可知B正確。句意：盡管地震科學(xué)家理解地震是如何為什么發(fā)生，但是預(yù)測通常是不準(zhǔn)確的。
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