某无色溶液中可能含有I－、NH+4、Cu2+、SO32－，向该溶液中加入少量溴水，溶液仍呈无色，则下列关于溶液组成的判断正确的是
①肯定不含I－； ②肯定不含Cu2+ ③肯定含有SO32－ ④可能含有I－
⑤可能含有SO32－
| A．①②③ | B．②④⑤ | C．①②⑤ | D．②③④ |
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