单项选择题

After our computer network （）for the third time that day, we all went home.

A. crashed
B. collided
C. smashed
D. fell

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单项选择题

I suggest that you offer your （）to a publisher at later date.

A. manual
B. manuscript
C. maneuver
D. miniature

单项选择题

While modulation demodulation technology was being standardized for the most recent modems, several other peripheral standards were also being developed（）

A. auxiliary
B. notable
C. relevant
D. elemental

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