英语单选一道51题～需要解释，谢谢啦！
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主语是glasses 眼镜，眼镜是被配好的: glasses were well fitted （眼镜不能主动自己去配）
when glasses were well fitted , glasses can correct most sight defects in healthy eyes.
当眼镜被配好，眼镜能够 矫正大多数视力缺陷。
* 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.
when glasses were well fitted , glasses can correct most sight defects in healthy eyes.
当眼镜被配好，眼镜能够 矫正大多数视力缺陷。
* 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.
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