If the patient vomits during mouth-to mouth resuscitation，the rescuer should FIRST（）.
A. ignore it and continue mouth-to-mouth ventilation
B. pause for a moment until the patient appears quiet again，then resume ventilation mouth-to-mouth
C. switch to mouth-to-nose ventilation
D. turn the patient's body to the side，sweep out the mouth and resume mouth-to-mouth ventilatio
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