【題目】Potatoes turn green when ________ to light.

A. exposed B. are exposed

C. being exposed D. to be exposed

【答案】A

【解析】

試題分析：考查非謂語動詞。be exposed to遭受，暴露于…，這里的exposed可以看作 when they are exposed to the light的省略。因為句子中有when,while等這些詞時，從句可以省略與主句相同的主語和be動詞。是使顯露的意思。故選A。

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