单项选择题

The reason why Jack failed to attend the lecture is because he had a had cold.

A．why
B．failed
C．attend
D．because
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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
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
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