单项选择题

Businessmen make most of their income from profit ______ by producing and selling products.

A．earning
B．is earned
C．earn
D．earned
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单项选择题
A．She went to the airport. B．She was busy on her assignment. C．She went to watch a movie. D．She went to see her friend.
A．She went to the airport.
B．She was busy on her assignment.
C．She went to watch a movie.
D．She went to see her friend.
单项选择题
A．A hotel clerk. B．A professor. C．A student. D．A park employee.
A．A hotel clerk.
B．A professor.
C．A student.
D．A park employee.
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