Question

I will work _________ five o'clock.

a. until

b. up

c. in

d. to

Answer 1

Option a is the correct answer.

I will work until five o’clock.

Here, until is used as a preposition to signify that the person will work up to that specific time and not at all after that time.

The preposition until is often shortened to till, and conveys the same meaning.

Answer 2

option (a) is correct.