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    Tom is keen surfing the Internet in his spare time. A. at B. on C. to D. in 【查看更多】

     

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     Tom is keen _____ surfing the Internet in his spare time.

      A. at         B. on         C. to         D. in

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    Tom is keen _____ surfing the Internet in his spare time.

      A. at         B. on         C. to         D. in

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