2. 外语
  3. Mr. Bridges mentioned briefly several other subjects in the course of his talk but mostly kept himself to the main topic.

Mr. Bridges mentioned briefly several other subjects in the course of his talk but mostly kept himself to the main topic.

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问题 Mr. Bridges mentioned briefly several other subjects in the course of his talk but mostly kept himself to the main topic.
选项 A、touched off
B、touched down
C、touched on
D、touched up
答案C
解析
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