Not until all the fish die in the river

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问题选择题

Not until all the fish die in the river ____ how serious the pollution was. [ ]

A. did the villagers realize

B. the villagers realized

C. the villagers realized

D. didn't the villagers realize

答案

答案：A

选择题

The long speech given by the old professor seemed _____ and endless. He felt so ______ that he nearly fell

asleep.[ ]

A. disappointed ; boring

B. disappointed ; bored

C. disappointing ; bored

D. disappointing ; boring

不定项选择

B．磁通量的变化率

C．功率

D．频率