单项选择题

During the 1990s world oil production will approach geological estimates of maximum production______, even with rapidly increasing petroleum prices.

A．capability
B．quota
C．potentiality
D．capacity
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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
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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