Multiple choice

I have been studying ............. 2 hours.

  1. in

  2. for

  3. since

  4. at
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We use "for" to specify a duration of time (e.g., "for 2 hours"), whereas "since" is used to specify a starting point in time (e.g., "since 2 o'clock").

Keep practicing — related questions