round the clock

adverb

rund um die Uhr

round-the-clock

adjective

round-the-clock surveillance/activity

Überwachung/Aktivität rund um die Uhr

round the clock

Spagnolo

Italiano

Complétez la séquence avec la proposition qui convient.

America … by Christopher Columbus in 1492.
- discovered
- was discovered
- is discovered