单项选择题

If payment is not received within five days, legal action will be our only ________.

A．selection
B．alternative
C．substitute
D．priority
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单项选择题
My vacation ________ with yours, so we won't see each other for a month or so.
A．overturns
B．overtakes
C．overthrows
D．overlaps
单项选择题
For many working mothers, balancing the demands of children and job is a(n) ________ challenge.
A．ultimate
B．durable
C．terminal
D．perpetual
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