单项选择题

You can' t ______your promise; all the people here are depending on you.

A．back off
B．back up
C．back on to
D．back out of
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单项选择题
The two astronauts have splashed down in the Pacific Ocean, only five miles from the aircraft carrier that was______ for the recovery mission.
A．detach
B．dispatched
C．devote
D．dismantled
单项选择题
The teacher ______from her custom and gave us no homework yesterday.
A．devoted
B．derived
C．deviated
D．developed
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