单项选择题

My mother always says if you keep on, you'll succeed ______.

A．in time
B．at one time
C．at the same time
D．on time
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单项选择题
--May I take your order now --OK, I'll come back in a few minutes.
A．Could you bring us the bill
B．Sure, we'd love to.
C．Yes, here it is. Thank you.
D．No, we need more time.
单项选择题
Jack, why ______ you telephone me at such an early time. I stayed up late last night.
A．must
B．can
C．may
D．need
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