3. 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、 switched B、 committed C、 favored D、 transmitted

3. 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、 switched
B、 committed
C、 favored
D、 transmitted

出自：大学英语

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