单项选择题

I spoke to him kindly _________ him.

A．not to frighten
B．so as not to frighten
C．in order to not frighte
D．for not frightening
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单项选择题
Gunpowder was discovered in the twelfth century, but _________.
A．man did not put it to use in war two hundred years later
B．until two centuries more it was used in war
C．not used in warfare until two hundred years later
D．in warfare did not use it two hundred years afterwards
单项选择题
In the Middle East area, oil is found in _________ and its production has been able to keep up with world demand.
A．efficiency
B．abundance
C．elegance
D．elahoration
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