单项选择题

Don't _____ the camera _______ unless you are sure you can put it together.

A．take... off
B．work... out
C．set... off
D．take... apart
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单项选择题
All their attempts to ______ the child from the burning building were in vain.
A．regain
B．recover
C．rescue
D．reserve
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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