单项选择题

The unit of measurement known as foot has originally based on the average size of the human foot.

A．measurement
B．has
C．size
D．foot
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单项选择题
The doctor told him that he should take this medicine one pill at one time.
A．told
B．should take
C．one
D．one
单项选择题
His parents are worried because they haven't heard of their son in more than two months.
A．worried
B．because
C．of
D．in
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