【单选题】
A input id="room" type="text" onfocus="this.style.backgroundColor='#CCCCCC'"
B input id="room" type="text" onfocus="this.backgroundColor='#CCCCCC'"
C input id="room" type="text" onblur="this.style.backgroundColor='#CCCCCC'"
D input id="room" type="text" onblur="this.backgroundColor='#CCCCCC'"
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