——,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

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^~^