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
They took _______ measures to prevent poisonous gases from escaping.
A．fruitful
B．beneficial
C．valid
D．effective
单项选择题
That was so serious a matter that I had no choice but _______ the police.
A．called in
B．calling in
C．call in
D．to call in
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