There are many ways of out the problem._刷题宝

题干

There are many ways of out the problem.

A：work

B：works

C：working

D：to work

上一题下一题 0.0难度选择题更新时间:2016-12-02 07:15:25

答案(点此获取答案解析）

C

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现有下列物质：①Cl₂②Na₂O₂③NaOH④HCl⑤H₂O₂⑥MgF₂⑦NH₄Cl

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阅读下面的短文，回答问题．

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请回答以下问题：

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