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Byron possessed powers of observation that would have made him a great anthropologist and that makes his letters as a group the rival of the best novels of the time.

A. makes his letters as a group the rival of

B. makes his letters as a group one to rival

C. makes his letters a group rivaling

D. make his letters as a group the rival of

答案是D，make sth+sth，双宾语。as a group是插入语。在SC中，很多插入语都可以省掉，尤其是在从句中。其它选项都有致命的错误：powers 是that从句修饰的被动，谓语动词应该是复数，ABC错。E的which只能引导非限定语从句，要么加介词，要么有逗号。

这个标题挺 s 的。。。