单项选择题

All the parts of these washing machines are ______ , so that it is very convenient to replace them.

A．normalized
B．modernized
C．mechanized
D．standardized
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You can't prescribe before you ______ as a doctor.
A．fit
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He ______ another career but, at the time, he didn't have enough money to attend graduate school.
A．might have chosen
B．might choose
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