phrase "I haven't a minute to spare"

[Irvin]

English Language Tests, Intermediate level

ESL/EFL Test #273 "When do you say this?", question 10

I say "I haven't a minute to spare" when I ..........

(a) have plenty of time
(b) am waiting for someone
(c) am very busy

English Language Tests, Intermediate level

ESL/EFL Test #273 "When do you say this?", answer 10

I say "I haven't a minute to spare" when I am very busy.

Correct answer: (c) am very busy

Your answer was: correct
_________________________

I don't understand!

Irvin

[Conchita]

When I am very busy I have a lot of things to do, so I don't have a minute to spare or to waste -- I don't have time for other things.