在pH为4~5的环境中，Cu2+、Fe2+不生成沉淀，而Fe3+几乎完全沉淀。工业上制CuCl2是将浓盐酸加热到80℃左右，再慢慢加入粗氧化铜（含杂质FeO），充分搅拌使之溶解。现欲除去溶液中的杂质离子，下述方法中可行的是 （ ）
| A．向溶液中加入纯Cu将Fe2+还原 |
| B．向溶液中通入H2S使Fe2+沉淀 |
| C．向溶液中通入Cl2，再通入CuO粉末调节pH为4~5 |
| D．向溶液中通入Cl2，再通入NH3调节pH为4~5 |
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