Student or Learner
I know WHICH is not used for people.
Can it be used for animals?
Why do I still find the sentence examples as follows ?
1. Which of the secretary do you like?
2. May and Bo are so pretty. I don't know which one to choose ?
Yes, one can use "which" or "that" for animals. In many cases, "who" is used.
In your sentence, "which" refers to a choice between two options. It is not a pronoun referring to people.
The first part should be "Which secretary" or "Which of the secretaries".
Retired English Teacher
Sure it can.
Your statement that "which" is not used for people is incorrect.
Which one of the secretaries do you like (prefer)?