单项选择题

21（）

A．before
B．after
C．in front of
D．behind

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Since Linda is both diligent and smart, I never doubt that she will ______.
A．success
B．succeed
C．successful
D．successor
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Please return in an hour. I'll be ready ______ then.
A．till
B．by
C．at
D．on
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