单项选择题

It seems that there is ______ that I can't do.

A．nothing
B．anything
C．everything
D．none
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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
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
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