单项选择题

You must shine your shoes.

A．lighten
B．clean
C．wash
D．polish
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单项选择题
Your compass and clock are the most essential instruments in sailing.
A．equipments
B．tools
C．instructions
D．opportunities
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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