(单选题)5: C#中,新建一个字符串变量str,并将字符串"Tom's_Living_Room"保存到串中,应该()
A: string str="Tom\'s_Living_Room";
B: string str="Tom's_Living_Room";
C: string str("Tom's_Living_Room");
D: string str("Tom"s_Living_Room");
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