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

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

A．a(chǎn)s 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．a(chǎn)s though                 B．now that              C．in case                D．while

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