I must admit ______ not my first choice!

fill this blank

that was not

there

I must admit, it's not my first choice!

To fill in the blank, you need to determine the missing word or phrase that fits contextually and grammatically. In this case, the phrase "is" seems a probable answer.

To determine this, consider the sentence structure and the phrase "not my first choice." It suggests that the speaker is conveying their preference or lack thereof. The verb "is" correctly expresses the subject (the undisclosed option) and reflects the personal opinion of the speaker. Therefore, the completed sentence would be: "I must admit, is not my first choice!"