Difference between start up and begin up

[Little Joe]

ESL/EFL Test "Start/Begin", question 10

I would greatly appreciate it if you didn't ......... up that old argument again.

(a) start
(b) begin
(c) starts
(d) begins

ESL/EFL Test "Start/Begin", answer 10

I would greatly appreciate it if you didn't start up that old argument again.

Correct answer: (a) start

Your answer was: incorrect
I would greatly appreciate it if you didn't begin up that old argument again.
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what's correct difference between start up and begin up?

[Alan]

Hi Little Joe,

The only phrasal verb is start up meaning begin again.

Alan
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English as a Second Language
You can read my ESL story Prepositions