These bits of information and the list of D grades were all the records had to offer.
all是代词、是所有些意思吗？the records had to offer是定语从句修饰all吗？had to在这的意思是
These bits of information and the list of D grades were all the records had to offer.
【翻译】这类信息和D等成绩表是履历档案所可以提供的（所有）。
【剖析】这个句子是有点特殊。
▲ 因为句子的主干是一个“主系表”结构，为了理解便捷，大家可以“主表颠倒”翻译：
“履历档案所可以提供的（所有）就是这类信息和D等成绩表。”
依据汉语习惯，“所有 ”二字可以不需要翻译出来，“所可以...的”本身就包含“所有”之意，特此说明。
▲ 翻译解决了，目前剖析all the records had to offer。
all是先行词，the records had to offer 是定语从句，all 之后省略了关系代词that。
had to offer 不是must offer 之意，这里had 是“有”的意思。主语不是“人”，而是the records，它没“意志性”。所以，had to offer 不是“不能不”。
完整的句子结构是如此的：
The records had all to offer. （all 作had 的宾语，to offer 作all 的定语）
假如主语是“人”，have to do 可能存在两种含义。
比如，a letter I have to write 就有两层含义：
1. I have to write a letter.
2. I have a letter to write.