已知x=(1,2,3)，y=("a","b")。则x+y的结果为
A
(1,2,3,"a","b")
B
(1,"a","b")
C
(1,2,3)
D
("a","b")
已知x=(1,2,3)，y=("a","b")。则x+y的结果为
A
(1,2,3,"a","b")
B
(1,"a","b")
C
(1,2,3)
D
("a","b")
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