Question

Being a nurse is hard work especially if you're...call all times the time a)in b)with c)on

Answer 1

... if you're ON call ...

Answer 2

The correct preposition to use in this sentence is "on." The correct sentence would be:

"Being a nurse is hard work, especially if you're on call all the time."

The preposition "on" is commonly used when referring to being on call, indicating that the nurse is available or ready to respond to calls or emergencies during a specified period.