—Which of these two English books will you borrow?—I’ll borrow of them because they are v

问题补充：

—Which of these two English books will you borrow?

—I’ll borrow of them because they are very interesting.

A. either

B. all

C. neither

D. both.

答案：

A. either

B. all

C. neither

(答案→)D. both.

解析： 根据下文内容because they are very interesting.可知应该是二者都，故选both。