单项选择题

A．Yesterday.
B．Two days ago.
C．Three days ago.
D．Early last week.
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填空题
At what age does a guide dog begin its training course At the age of ______.
单项选择题
A．One.B．Two.C．Three.D．Four.
A．One.
B．Two.
C．Three.
D．Four.
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