Round the clock

[Nasreddin]

Test No. incompl/inter-78 "Tick Tock", question 5

It's an amazing system so that at whatever time of day you can always get a response as the staff are there ......... the clock.

(a) along
(b) round
(c) about
(d) down

Test No. incompl/inter-78 "Tick Tock", answer 5

It's an amazing system so that at whatever time of day you can always get a response as the staff are there round the clock.

Correct answer: (b) round

Your answer was: n/a
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What does it mean staff around clock?

[Torsten]

There are employees on duty 24 hours a day (they work in shifts, of course.)

TOEIC listening, talks: Evening traffic update on local radio station

[Watie]

Hello,
Would you please explain to me the difference between 'along' and 'round'?
As I know so far, the words both mean 'a direction'.
Thank you.

[Kitosdad]

Good morning Watie. We walk along a road, and go a/round a bend in the road.

Along this street you will find a cinema.

Go a/round the corner and there is another one too.
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Keep it simple ... Keep it interesting.

[Dongocan]

around the clock is an idm, meaning:all day and all night without stopping