A primary school in England has ____ signs at its three entrances（入口）， saying： Greet your child with a smile， not a mobile．（ ）
A．put intoB．put offC．put onD．put up
A primary school in England has ____ signs at its three entrances（入口）， saying： Greet your child with a smile， not a mobile．（ ）
A．put intoB．put offC．put onD．put up
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