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
The playwright was known not for his original ideas but for his ______ of ideas that had been propounded by others.
A. invention
B. reiteration
C. consideration
D. rejection
单项选择题
Ice skates manufactured entirely of iron were first sold in the 1800’s（）

A. mainly
B. successfully
C. solely
D. routinely
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