——,glasses can correct most sight defects in healthy eyes 为什么填when well fitted

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——,glasses can correct most sight defects in healthy eyes 为什么填when well fitted

——,glasses can correct most sight defects in healthy eyes 为什么填when well fitted
——,glasses can correct most sight defects in healthy eyes 为什么填when well fitted

——,glasses can correct most sight defects in healthy eyes 为什么填when well fitted
when well fitted是省略了的时间状语从句, 相当于: when glasses are well fitted

当从句的主语与主句的主语相同,且从句的谓动含有be动词时,可以省略主语及be 动词. 所以此句要填when well fitted.

句意: 当(眼镜)配得合适时, 眼镜能矫正健康眼睛的大部分视力缺陷.

您好,这里填when well fitted是省略主语的用法,补充完整是when (the glasses are) well fitted,表示【当眼镜被调整好的话】。希望能解答您的疑惑^~^