单项选择题

You'd better hurry, ______ you might be late for class.

A．or
B．and
C．unless
D．but
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These computer programs are a ______ to me.
A．problem
B．difficulty
C．puzzle
D．question
单项选择题
The fishing boat sank below the waves, and was seen ______.
A．any more
B．not more
C．no more
D．not any
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