1. Have you been working too hard lately?
2. Have you been standing in this cold long?
3. She has been scrubbing the floor for three hours.
4. They have been singing at the top of their voices since morning.
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Answers & Comments
1. Have you been working too hard lately?
2. Have you been standing in this cold long?
3. She has been scrubbing the floor for three hours.
4. They have been singing at the top of their voices since morning.