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
Medicine depends on other fields for basic information, particularly some of their specialized branches.
A．conventionally
B．obviously
C．especially
D．inevitably
单项选择题
The travelers were ready to enjoy the spectacular tidal waves when suddenly a thick fog came up and obscured the whole scene.
A．blurred
B．belittled
C．banned
D．collapsed
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