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
Bicycles make the air ______.
A．clean
B．dirty
C．noisy
D．fresh
单项选择题
Teenagers shouldn't be ______ from school although they don't do well in studies.
A．disappeared
B．gone
C．removed
D．beaten
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