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.)
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Test Of English for International Communication
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