单项选择题

____________ everything means to know nothing.

A．To know
B．Knowing
C．One knows
D．You know
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单项选择题
They told me that he had left for the country some days___________.
A．ago
B．after
C．long
D．before
单项选择题
Now that we have a computer, we can ____________ everything we need easily.
A．look on
B．look in
C．look up
D．look down
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