单项选择题

None of the servants were ______ when Mr. Smith wanted to send a message.

A．available
B．attainable
C．approachable
D．applicable
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单项选择题
Learning to use computers is what we want to ______ from the program.
A．help
B．make
C．aid
D．benefit
单项选择题
Establishment of a ______ insurance system is essential for economic reforms.
A．accurate
B．sound
C．undisturbed
D．safe
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