2. 专升本
  3. At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly______to

At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly______to

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问题 At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly______to another subject.
选项 A、committed
B、switched
C、favored
D、transmitted
答案B
解析
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