单项选择题

During daylight hours, birds ______.

A．fly aimlessly
B．rely on landmarks
C．use sun for guidance
D．are more likely to get lost
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单项选择题
______ how to do, the little boy cried.
A．Not knowing
B．Don't know
C．Knowing not
D．Not known
单项选择题
Hardly in my life ______ such a thing.
A．I experienced
B．have I experienced
C．had I experienced
D．I experience
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