单项选择题

Please keep an eye on my luggage, and I'll be back______.

A．in time
B．in no time
C．at one time
D．at a time
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单项选择题
The ______ goal of the book is to help bridge the gap between research and teaching, particularly the gap between researchers and teachers.
A．joint
B．intensive
C．overall
D．decisive
单项选择题
______ the fog, we should have reached our destination.
A．Because of
B．In spite of
C．In case of
D．But for
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