```go
package main
import "fmt"
func main() {
x := []int{1, 2, 3}
for i := range x { x = append(x, i) }
fmt.Println(x)
}
```
备选答案:
- A: [1 2 3]
- B: [1 2 3 1 2 3]
- C: [1 2 3 0 1 2]
- D: 死循环
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