when。当他的视力开始逐渐下降，他发现越来越难读书了。求分析翻译：“他发现这个东西（书，报纸等，要视上下文而定）越来越难读了，因为他的视力开始衰退。”for：因为
知识点：for 不仅可以用作介词，而且可以用作并列连词，连接一个并列的分句。其词义是“因为”，但是并不构成原因状语从句。查一下词典可以找到这种用法。这里放for比较合适昨天以为只有那两个选项并列连词的概念：
连词是一种...
英语求助He found it increasingly diffcult to read,_____ his eyes
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