单项选择题


A．places
B．where
C．when
D．what
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A．migrateB．immigrateC．emigrateD．transfer
A．migrate
B．immigrate
C．emigrate
D．transfer
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The space shuttle Discovery completed its mission for about ______ days before it returned to Kennedy Space Center.
A．10
B．11
C．90
D．94
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