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    【题目】Potatoes turn green when ________ to light.

    A. exposed B. are exposed

    C. being exposed D. to be exposed

    【答案】A

    【解析】

    试题分析：考查非谓语动词。be exposed to遭受，暴露于…，这里的exposed可以看作 when they are exposed to the light的省略。因为句子中有when,while等这些词时，从句可以省略与主句相同的主语和be动词。是使显露的意思。故选A。

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