单项选择题

Anna was reading a piece of science fiction, completely ______ to the outside world.

A．having been lost
B．to be lost
C．losing
D．lost
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单项选择题
After a concert tour in Asia, Canada and the U.S. , he will ______ work on a five-language opera.
A．confine
B．indulge
C．resume
D．undergo
单项选择题
These varied racial groups have learned to live together in peace and ______ , setting an example well worth following.
A．harmony
B．grace
C．rhythm
D．relief
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