单项选择题

We'll visit Europe next year ______ we have enough money.

A．lest
B．until
C．unless
D．provided
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单项选择题
Dr. Smith failed many times but he finally ______ to find a successful way to solve the problem.
A．broke off
B．broke down
C．broke out
D．broke through
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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