I have finished a large part of the novel written by Dickens, the rest of which very diff

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(答案→)A. is
B. are
C. was
D. were
解析：句意：我已经看完了狄更斯写的小说的一大部分，其余的很难。定语从句中的主语是the rest of which，主语是the rest of+名词的时候，谓语取决于名词，这里which指的是the novel，所以谓语是单数，而且这部分很难是客观事实，用一般现在时，选A。