单项选择题

—— When will you be back？ 　　—— I’ll be back _____a couple of days.

A．after
B．for
C．about
D．in
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单项选择题
This is the same knife _____ I lost yesterday.
A．which
B．what
C．like
D． as
单项选择题
He will never forget the days _____ he spent in Japan.
A．when
B．after
C．that
D．how
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