单项选择题

They took ______ measures to prevent poisonous gases from escaping.

A．fruitful
B．beneficial
C．sufficient
D．effective
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Next time I go there, I ______ them about what has happened recently.
A．ask
B．shall ask
C．asked
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Some people have nothing to eat, ______ others eat too much.
A．until
B．unless
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