there be句型中,be动词时用单数还是复数,采取的是就近原则,即取决于be动词后的名词,最近的是单数,就用is,复数就用are.
there is a pen and two books.
there are two books and a pen.
而题目中,名词为nothing.什么都没有,将其看作单数.所以用is.