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【单选题】
下列代码存在一个编译错误。如何消除该错误?(左边为行号) 1 public void Test(object param) { 2 Resource r0 = new Resource(100); 3 using( Resource r1 = new Resource(100)) { 4 r1.print(); 5 r1 = new Resource(50); 6 } 7 }( 2 分)A.
第1 行声明的param 参数未在方法内使用。删除该参数；
B.
第3 行修改为：using( Resource r1 = new Resource(100)；) {
C.
删除第5 行
D.
第5 行修改为：r1=r0;
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