4. C#中,新建一字符串变量str,并将字符串"Tom's Living Room"保存到串中,则应该使用下列哪条语句
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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