-Excuse me is there book by Mo Yan? -Yes. It’s on bookshelf over there.A. a; /B. a; the

问题补充：

-Excuse me, is there book by Mo Yan?

-Yes. It’s on bookshelf over there.

A. a; /

B. a; the

C. / ; the

D. the; a

答案：

A. a; /

(答案→)B. a; the

C. / ; the

D. the; a

解析：句意：--打扰了，这有莫言写的书吗？--有。它在那边的书架上。分析第一次提到的事物有不定冠词。答语中对书架进行了特指，有莫言作品的书架。因此用冠词the.故选B