单项选择题

I tried hard, but I couldn''t find the _________to the problem.

A．solution
B．help
C．reply
D．demand
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单项选择题
Lisa was busy taking notes _________ Mark was searching the Internet for the information.
A．until
B．unless
C．while
D．if
单项选择题
My mistake in judgment _________the failure.
A．broke off
B．brought out
C．resulted from
D．led to
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