用is还是are :this story is fantastic ,but some of it_hard to understandthis story is fantastic ,but some of it_hard to understand A.is B.are

问题描述:

用is还是are :this story is fantastic ,but some of it_hard to understand
this story is fantastic ,but some of it_hard to understand A.is B.are

is

is
因为some 作主语时,谓语动词的单复数取决于of 后面的词,本句:of 后接it,是单数.