题目内容：
At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly _________ to another subject.A) committed B) switched
C) favoured D) transmitted
参考答案：
选择题：At first, the speaker was referring to the proble
- 题目分类：语言/文学
- 题目类型：选择题
- 查看权限：VIP