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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单项选择题
I like that son of ______.
A．John's sister
B．John sister's
C．John's sister' s
D．sister's John' s
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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