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    17、―How did you lose all those files (文件)?

    ―The electricity went off _______ I was working on my computer.

    A．as though                 B．now that              C．in case                D．while

    17、D

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    ―How did you lose all those files (文件)?

    ―The electricity went off _______ I was working on my computer.

    A．as though                 B．now that              C．in case                D．while

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