单项选择题

Advertising media like direct mail, radio, television and newspapers ______ to increase the sales of industrial products.-

A. have been used
B. will be used
C. is being used
D. has been used
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单项选择题
______ native to North America, corn has now spread all over the world.
A. In spite of
B. That it is
C. It was
D. Although
单项选择题
In American universities, classes are often arranged in more flexible ______ and many jobs on campus are reserved for students.
A. scales
B. ranks
C. grades
D. patterns
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