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 as soon as I know what______.
A．I' 11 phone...does happen
B．I' 11 phone.., has happened
C．I am phoning.., happens
D．I am going to phone.., happens
单项选择题
The meeting was so prolonged and exhausting that______ the speakers stopped for refreshments.
A．at ease
B．at random
C．at intervals
D．at large
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