单项选择题

Delaying the problem too long won't help ______ it.

A．solving
B．solve
C．to solve
D．solves
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单项选择题
Not all details of the microchip's performance are ______
A．available
B．adequate
C．sufficient
D．approachable
单项选择题
To some extent, the principle of secrecy has been ______
A．maintained
B．held
C．observed
D．implemented
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