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    精英家教网 > 高中英语 > 题目详情

    【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】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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