English Language · English
Combine the following pair of sentences into a single meaningful sentence: How long has she been waiting for the bus? I am not sure.
- 1I am not sure for how long she has been waiting for the bus.
- 2I am not sure that how long she has been waiting for the bus.
- 3I am not sure how long has she been waiting for the bus?
- 4I am not sure how long she has been waiting for the bus.✓
Correct answer
I am not sure how long she has been waiting for the bus.
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