单项选择题

Until then, his family ______ from him for six months.

A．didn' t hear
B．hasn' t been hearing
C．hasn' t heard
D．hadn' t heard
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单项选择题
You'll not be afraid of snakes if you understand their ______.
A．habits
B．desires
C．customs
D．manners
单项选择题
Little ______ that the police are about to arrest him.
A．he knows
B．he doesn' t know
C．does he know
D．doesn' t he know
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