The light will be thrown ______ the cause of cancer by research that is now in progress.
A．toB．uponC．in D．for
B
考查介詞的用法。句意“正在進(jìn)行的研究將對(duì)癌癥的起因進(jìn)行解釋�！眛hrow light on/upon sth.“解釋，闡明”。故選B。
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