问题描述:

单选题

The light will be thrown ______ the cause of cancer by research that is now in progressA.toB.uponC.inD.for

网友答案:
B解析考查介词的用法。句意“正在进行的研究将对癌症的起因进行解释。”throw light on/upon sth.“解释,阐明”。故选B。
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