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
Doctors sometimes ______old cures when modem medicine doesn't work.
A．fall on
B．fall down on
C．fall back on
D．fall in upon
单项选择题
Their ______building is located next to the park, so it is very convenient for them to have a walk after supper.
A．residential
B．presidential
C．conditional
D．accidental
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