______, 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、Well fitted when
C、Well fitted if
D、If well fitted when

答案A

解析 分词。原句中已出现完整句子,那么前面填入的只能是从句。when well fitted是when they are well fitted的省略形式。
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