单项选择题

The digestive enzyme pepsin breaks down proteins into components______ readily absorbed by the human body.

A．that can be
B．and are
C．which they
D．are to be
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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
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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