设s="abcd",s1="123",则执行语句s2=InsStr(s,2,s1)后,s2=()
设s="abcd",s1="123",则执行语句s2=InsStr(s,2,s1)后,s2=()
设s="abcd" ,s1="123" ,则执行语句s2=InsStr(s,2,s1)后,s2= A: "123abcd" B: "a123bcd" C: "ab123cd" D: "abc123d"
设s="abcd" ,s1="123" ,则执行语句s2=InsStr(s,2,s1)后,s2= A: "123abcd" B: "a123bcd" C: "ab123cd" D: "abc123d"
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