单项选择题

It 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

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单项选择题
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
单项选择题
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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