单项选择题

It is only when you overcome all difficulties and reach your goal ______ fully aware that the way to success is not paved with flowers.

A．do you become
B．then you become
C．that you become
D．have you become
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单项选择题
The invention of electricity made great contribution to civilization ______ which subsequently there are few findings comparable until now.
A．to
B．in
C．for
D．from
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