______, glasses can correct most sight defects in healthy eyes.

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问题 ______, glasses can correct most sight defects in healthy eyes.

选项 A、When well-fitted
B、If well-fitting
C、When well-fitting
D、If well-fitted when

答案A

解析 译文:如果眼镜很合适,能纠正健康眼睛中的视力缺陷。分词用法题。本句中分词与句子主语构成动宾关系,故应用过去分词,四个选项中只有[A]正确。
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