The customer didn't choose ________ of the ties and went away without looking at a third one．

A.many

B.any

C.all

D.either

答案及解析： D

解析：

由后面的“a third one”可知，顾客只看了两条领带，但哪条都未选。四个选项中，只有D项either用于两者。故选D。