单项选择题

This problem should be discussed first, for it takes ______ over all the other issues.

A．precedence
B．prosperity
C．presumption
D．probability
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单项选择题
It was clear that the storm ______ his arrival by two hours.
A．retarded
B．retired
C．refrained
D．retreated
单项选择题
He added a ______ to his letter by saying that he would arrive before 8 pm.
A．presidency
B．prestige
C．postscript
D．preliminary
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