_____the report on the computer,the electricity was suddenly cut off.A.While typed up B.While typing up C.While he was typing up D.He was typing up

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_____thereportonthecomputer,theelectricitywassuddenlycutoff.A.WhiletypedupB.WhiletypingupC.Whilehewa

_____the report on the computer,the electricity was suddenly cut off.A.While typed up B.While typing up C.While he was typing up D.He was typing up
_____the report on the computer,the electricity was suddenly cut off.
A.While typed up B.While typing up C.While he was typing up D.He was typing up

_____the report on the computer,the electricity was suddenly cut off.A.While typed up B.While typing up C.While he was typing up D.He was typing up
C 句子主语是the electicity,而从句中的主语不可能是the electicity,所以选C

选C
前后的主语不是一回事,而且while是可以引导完整句子的。