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
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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
单项选择题
The same factors push wages and prices up together, the one ______ the other.
A．emphasizing
B．reinforcing
C．multiplying
D．increasing
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