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As a result of __ is now known in physics and chemistry, scientists have been able to make important discoveries in biology and medicine.
A．itB．whatC．whichD．that
B

試題分析：句意：由于在物理學和化學上已知的知識的原因，科學家們已經能夠在生物學和醫(yī)藥上取得重要發(fā)現(xiàn)。what 引導賓語從句，在從句中做主語。在賓語從句中，which 是哪一個，that不做成分。故選B。
考點: 考查從句關系詞的用法。
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