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    20、David decided not to work on the program in the office because she didn’t want her boss to know what she __________.

    A. was doing                B. is doing                       C. has done               D. had done

    20、A

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    David decided not to work on the program in the office because she didn’t want her boss to know what she __________.

    A. was doing                B. is doing                       C. has done               D. had done

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