单项选择题

Passengers should ______ for flight BA125 to Berlin.

A．check in
B．check off
C．check up
D．check out
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单项选择题
I must confess that this is the most ______ case I have ever handled.
A．sophisticated
B．complicated
C．complex
D．easy
单项选择题
Storage will be ______ on each piece of luggage remaining at stations over 24 hours.
A．expended
B．offered
C．cost
D．charged
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