单项选择题

______for aches, pains and fever, Aspirin is now the subject of multiple investigations of its role in treating many more serious complaints.

A．Long used
B．Being used long
C．Having been long used
D．It has long been used
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单项选择题
She is ______a musician than her brother.
A．much of
B．much as
C．more of
D．more as
单项选择题
To acquire education is principal way of gaining status in a culture that generally stresses achievement, skillfulness, and upward ______.
A．mobility
B．motivation
C．ambition
D．promotion
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