Flie vs. flow

[rita]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #13 "Time Expressions (1)", question 9

Time ........., it's difficult to believe that we've been here all day.

(a) flows
(b) flies
(c) flees
(d) files

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #13 "Time Expressions (1)", answer 9

Time flies, it's difficult to believe that we've been here all day.

Correct answer: (b) flies

Your answer was: incorrect
Time flows, it's difficult to believe that we've been here all day.
_________________________

why using flies instead of flow, like go with the flow?

[Mister Micawber]

.
The idiom/proverb is Time flies, meaning it passes rapidly.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber