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【题目】We should protect our eyes. Sometimes we don’t realize how important they are_____we become poor in eyesight.

A.unlessB.untilC.sinceD.after

【答案】B

【解析】

句意:我们应该保护我们的眼睛。有时我们直到视力变差才意识到它们有多重要。

本题考查连词。unless除非;until直到;since 自从;after在……以后。根据固定结构,not....until.... 直到……才……。结合句意可知,此空应填until,故选B

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