At first, the speaker was referring to the problem of pollution in the country,

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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、favored
C、transmitted
D、switched

答案 D

解析一开始，演讲者讲的是这个国家的污染问题，但讲到一半，她突然换了一个话题。动词辨析题。commit意为“犯罪；保证”；favor意为“喜欢，青睐”；transmit意为“传送”；switch意为“转变，突变”。根据句意可知，D项为正确答案。

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