单项选择题
______ the knowledge, he didn't know how to ask the way.
A．Knowing not
B．Having not known
C．Not knowing
D．Not to know
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单项选择题
She didn't know ______ .
A．where she gets the book
B．where would she get the book
C．where getting the book
D．where to get the book
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单项选择题
You'll run ______ trouble if you don't take care.
A．down
B．at
C．across
D．into
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