Error detection: The students have been waiting for the teacher since three hours.
- For
- Have been
- Since
- None of these
Explanation
- Since is used with a specific point in time (e.g., since 9 AM, since Monday).
- For is used with a duration of time (e.g., for three hours, for two days).
- Correct sentence: The students have been waiting for the teacher for three hours.
Last verified on 09-02-2026
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