at a moment's notice

[deleted]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #694 "Prepositional Phrases - At, By, For and To (5)", question 2

When you are a firefighter, you have to be able to respond ......... a moment's notice because emergencies are not planned and fast reaction time is a matter of life and death in this profession.

(a) at
(b) by
(c) for
(d) to

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #694 "Prepositional Phrases - At, By, For and To (5)", answer 2

When you are a firefighter, you have to be able to respond at a moment's notice because emergencies are not planned and fast reaction time is a matter of life and death in this profession.

Correct answer: (a) at

Your answer was: incorrect
When you are a firefighter, you have to be able to respond to a moment's notice because emergencies are not planned and fast reaction time is a matter of life and death in this profession.
_________________________

Why should I use AT instead of TO?

[Beeesneees]

You don't respond to the notice, you respond to the emergency.

The 'at' refers to the time it takes you to respond.
You respond at very short notice.
_________________
"Inside every old person is a young person wondering what happened."
Terry Pratchett