单项选择题


A．allowed
B．forced
C．enforced
D．lured
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单项选择题
A．properB．indirectC．correctD．wrong
A．proper
B．indirect
C．correct
D．wrong
单项选择题
The space shuttle Discovery completed a ______ mission upon its return to Kennedy Space Centre.
A．11-day
B．94-day
C．10-day
D．49-day
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