I have been studying _____ 3 hours.
- From
- For
- Since
- None of these
Explanation
- Correct sentence: "I have been studying for 3 hours."
- For is used to show a duration of time (e.g., for 3 hours, for two days).
- Since is used with a starting point in time (e.g., since 9 a.m., since Monday).
Last verified on 09-06-2026
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