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The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.

   A. held on    B. worked out    C. touched on    D. kept out of

The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.

   A. held on    B. worked out    C. touched on    D. kept out of

The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.

　　A. held on    B. worked out    C. touched on    D. kept out of

The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.

　　A. held on    B. worked out    C. touched on    D. kept out of

The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.