单项选择题

Manufacturing companies spend millions of pounds trying to convince customers that their products are ______ to those of others.

A．better
B．best
C．super
D．superior
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单项选择题
So little ______ about physics that the lecture was completely beyond me.
A．I knew
B．did I know
C．I had known
D．had I known
单项选择题
The electric shaver needs ______ before it can be used.
A．repairing
B．to repair
C．being repaired
D．to be repairing
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