I’m very sorry to have （） you with so many questions on such an occasion.

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The price of beer （） from 50 cents to $ 4 per liter during the summer season.

A．altered
B．ranged
C．separated
D．differed