Question

You must be back ___ four o'clock.
(1.0)Marks
Answer:
in
for
by
to

Answer 1

Answer:

You must be back by four o'clock.

Explanation:

It's the one that makes the most sense.

Answer 2

Answer:

You must be back by four o'clock.

Explanation:

This makes the most sense among the other options.

You cannot use "in" as it's not a place but a timing.

You cannot use "for" as it's not a person.

You cannot use "to" as it's not a location or destination.