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

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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

解析当从句的主语与主句的主语相同，且从句的谓语动词含有be动词时，从句中可以省略主语及be动词。本句中when well-fitted是省略了的时间状语从句，相当于when glasses are well-fitted, well．fitted表示“合适的”，所以A项正确。

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