单项选择题

By 2050 the world will have about 2 billion people aged over 60，three times _____today.

A．as much as
B．as that of
C．as many as
D．as those of
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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
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
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