Difference between closing down and shutting down

[Jolie]

Test No. incompl/inter-10 "Close/Shut", question 6

Everything in that shop is now very cheap because they are having a ......... down sale.

(a) shuts
(b) shutting
(c) closes
(d) closing

Test No. incompl/inter-10 "Close/Shut", answer 6

Everything in that shop is now very cheap because they are having a closing down sale.

Correct answer: (d) closing

Your answer was: incorrect
Everything in that shop is now very cheap because they are having a shutting down sale.
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Can you tell me why use "closing" here?

[Alan]

This means ending the business/stopping trading. Shut down is often to turn off a machine/engine - usually something very big as in: The Government has agreed to shut down the nuclear power station.
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English as a Second Language
You can read my ESL story Saying It Twice

[Suhaizan]

HI,

if i write- lets go for shopping, now there are some closing down sale in most shopping centre-

is this correct?

[Mister Micawber]

No.

Let's go shopping. Now there are closing-down sales in most shopping centres.
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Native English teacher at Mister Micawber's