单项选择题

It was clear that the storm ______ his arrival by two hours.

A．retarded
B．retired
C．refrained
D．retreated
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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
单项选择题
The ______ of gifted children into accelerated classes will start next week according to their academic performance.
A．segregation
B．specification
C．spectrum
D．subscription
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