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    21、While he __________ in Europe, he __________ some photographs of many universities.

      A. traveled; was taking                    B. was traveling; took

      C. traveled; had taken                     D. was traveling; had taken

     

     

    21、C

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    While he __________ in Europe, he __________ some photographs of many universities.

      A. traveled; was taking                    B. was traveling; took

      C. traveled; had taken                     D. was traveling; had taken

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