【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】考查非謂語(yǔ)動(dòng)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?yàn)榫渥又杏衱hen,while等這些詞時(shí)，從句可以省略與主句相同的主語(yǔ)和be動(dòng)詞。是使顯露的意思。故選A。

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