单项选择题

The meeting______ in October, put the plan has been put off again and again.

A．was to have been held
B．ought to have held
C．was to be held
D．must have been held
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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
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
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