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
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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
单项选择题
John is the only One of the students who ______ to France.
A．has been
B．have been
C．had been
D．has being
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