单项选择题

______ the balcony, it could have saved me a lot of troubles.

A．Have I known
B．Had I known
C．I have known
D．I had known
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单项选择题
We would keep you ______ of how our work was going on.
A．know
B．noticed
C．recognize
D．informed
单项选择题
Those who are gifted in music are ______ for special training.
A．picked up
B．singled out
C．elected
D．showed off
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