设s="HE IS A WORKER",t="WORKER"。则index(s,t,5)的返回值是()。 A.4B.5C.6D.9E.10
设s="HE IS A WORKER",t="WORKER"。则index(s,t,5)的返回值是()。
A.4
B.5
C.6
D.9
E.10
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