单项选择题

Coffee has been a favorite drink for centuries，_______the time when we were drinking it strong and black，without sugar.

A．during
B．for
C．before
D．since
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单项选择题
You______ engage in serious debate or discussion unless you are willing to endure attacks.
A．have better not
B．had better not
C．have better not to
D．had better not to
单项选择题
This video may be freely reproduced _______ commercial promotion or sale.
A．as for
B．except for
C．thanks to
D．up to
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