单项选择题

If she ______ on students for her business, she would have to close her shop.

A．depends
B．should depend
C．had depended
D．depended
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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
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