——Which of the two English dictionaries will you buy?——I’ll buy of them so I can give on

问题补充：

——Which of the two English dictionaries will you buy?

——I’ll buy of them, so I can give one to my friend Helen.

A. either

B. both

C. all

D. neither

答案：

A. either

(答案→)B. both

C. all

D. neither

解析：根据后文的叙述，说明买两个，故选B