单项选择题

I didn't immediately realize that how serious the situation was.

A．once more
B．right now
C．fight down
D．once again
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Successful leaders dominate events rather than react to them.
A．control
B．contribute
C．convey
D．contact
单项选择题
You must shine your shoes.
A．lighten
B．clean
C．wash
D．polish
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