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Busy with the study, Sandy couldn't go out with her friends.
Q: Which sentence cannot be replaced by the sentence above?
1. Because Sandy was busy with the study, she couldn't go out with her friends.
2. Was busy with the study, Sandy couldn't go out with her friends.
3. Being busy with the study, Sandy couldn't go out with her friends.
2.
Was busy with the study, Sandy couldn't go out with her friends.