— Which of these two books will you take?—I will take in case the trip is boring.A. all B

问题补充：

— Which of these two books will you take?

—I will take in case the trip is boring.

A. all

B. either

C. both

D. neither

答案：

A. all

B. either

(答案→)C. both

D. neither

解析：考查代词。根据上文的two books知道这里应该是both.句意：—这两本书你要带哪一本？

—我都带着以防旅行无聊。