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)_做题室

单项选择题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：
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