问题
选择题
______ the paper 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
答案
答案：C
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______ the paper 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
答案：C