(单选题)

______, glasses can correct most sight defects, whether near-sighted or far-sighted in healthy eyes, especially for young people.

A.When well fitted

B.Well fitted when

C.Well fitted if

D.If well fitted when

参考答案：A

参考解析：

考查省略主语和be动词的用法。句意：当眼镜（配得）合适时，可以矫正大多数视力缺陷，无论是近视还是远视，特别是年轻人。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，且从句的谓语动词含有be动词时，可以省略主语及be动词。故选A。

知识点：

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