At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly to _____ another subject. ( 章节：1 难度：3)
- A、committed
- B、changed
- C、favored
- D、transferred
正确答案:B
答案解析:有
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At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly to _____ another subject. ( 章节：1 难度：3)
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