单项选择题

Hellen Keller's ______ over deafness, blindness, and muteness was a miracle.

A．improvement
B．success
C．advance
D．triumph
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单项选择题
Where can I find Jim He is ______ his work. He won' t leave the lab until 6:00 p. m.
A．on
B．over
C．at
D．under
单项选择题
We find that some birds ______twice a year between hot and cold countries.
A．transfer
B．migrate
C．commute
D．mobilize
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