单项选择题

The price of beer ______ from 50 cents to 4 dollars per liter during the summer season.

A．altered
B．ranged
C．separated
D．differed
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单项选择题
If the whole operation ______ beforehand, a great deal of time and money would have been lost.
A．was not planned
B．has not been planned
C．had not been planned
D．were not planned
单项选择题
I m very sorry to have ______ you with so many questions on such an occasion.
A．interfered
B．offended
C．impressed
D．bothered
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