单项选择题

All the parts of this washing machine are ______, so that it is very convenient to replace any of them.

A．normalized
B．mechanized
C．modernized
D．standardized
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单项选择题
The research institute has recruited 25 university graduates ______ in science.
A．majored
B．majoring
C．having majored
D．have majored
单项选择题
No one hopes that he will ______ his usefulness.
A．retain
B．keep
C．prolong
D．survive
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