_____, glasses can correct most sight defects in healthy eyes.A、When well-fitted

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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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_____,glassescancorrectmostsightdefectsinhealthyeyes.A、Whenwell-fitted