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A sentence in a student paper reads: "The nurse washed her hands, put on gloves, and the sterile tray was opened." Which revision improves parallel structure?
The nurse washed her hands, put on gloves, and the sterile tray was opened.
The nurse washed her hands, gloves were put on, and opened the sterile tray.
The nurse washed her hands, put on gloves, and opened the sterile tray.
The nurse washing her hands, putting on gloves, and the sterile tray opened.
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