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
Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which______ affects the circulatory system.
A．in the long run
B．in turn
C．in return
D．as a result
单项选择题
The students were much encouraged______, a chance to talk with the Americans in English.
A．to get
B．given
C．to have got
D．having got
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