单项选择题

There is something wrong with my ear, so I must have it ______.

A．checking
B．checked
C．to check
D．check
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单项选择题
His excuse ______ being late was not accepted.
A．for
B．about
C．over
D．to
单项选择题
Oxygen is one of the elements ______ water consists.
A．of which
B．of that
C．by which
D．that
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