单项选择题

When he started his company, Don______.

A．spent most of his time on test flights
B．was mainly interested in designing balloons for advertising
C．worked hard, whereas now he relaxes
D．built the balloons at home

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热门试题

单项选择题

He began working with balloons______.

A．as a relaxation from his work on aircraft
B．as part of his job at the time
C．as a hobby
D．when he heard that some Americans had crossed the Atlantic in one

单项选择题

Don Cameron's interest in flying______.

A．began when he was very young
B．began at university
C．came from a with to imitate his grandfather
D．was the result of his professional experience