R was only after some progress __ in the use and development of elec-考呗网题库移动版

单选题 R was only after some progress __ in the use and development of electric current that men began to realize the importance and possibilities of magnetism．

A． had been made
B．would have been made
C．has been made
D．was made

参考答案A

解析: A。直到电流的使用和发展取得了一些进步，人类才开始意识到磁力的重要性和可能性。考查被动语态。make progress in…的被动语态是progress is made in…。

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单选题 At last she left her house and got to the airport, only__ the plane flying away．

A．having seen
B．to have seen
C．to see
D．saw

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单选题 A large fish was slowly swimming through the water, its tail __ back and forth like the pendulum of a clock．

A．swung
B．was swinging
C．was swung
D．swinging

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单选题 They are teachers and don't realize __ to start and run a company．

A．what it takes
B．what takes it
C．what they take
D．what takes them

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