单项选择题

The polar explores took every precaution to ______ the dangers of their trip.

A．optimize
B．standardize
C．energize
D．minimize
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单项选择题
Mrs. Brown is so ______ about her housework that servants will not work for her.
A．special
B．especial
C．peculiar
D．particular
单项选择题
I was ______ work last week, but I change mind.
A．to have started
B．to start
C．to be starting
D．to have been starting
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