单项选择题

The brain is capable of ignoring pain messages if ______ to concentrate on other activities.

A．it allowed
B．is it allowed
C．allowed
D．allowed it
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单项选择题
In some countries, ______ is called equality does not really mean equal rights for all people.
A．that
B．what
C．which
D．how
单项选择题
The new law will come into ______ on the day it is passed.
A．effect
B．use
C．service
D．existence
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