单项选择题

She was happy ______ with her aunt since she was five years old.

A．having stayed
B．having been staying
C．to stay
D．to have been staying
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单项选择题
______ the result, I would not have asked you to tell me.
A．If I know
B．Had I known
C．I had known
D．If I knew
单项选择题
______ , he knows a lot.
A．As he is young
B．Young as he is
C．AS he young is
D．As young he is
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