单项选择题

The plane was delayed ______.

A．by the bad weather
B．by the passengers
C．because of many cars on the road
D．because something was wrong with the machine
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单项选择题
They were in a big hall, waiting for ______.
A．the girl to give them information
B．their flight to be announced
C．the free meal voucher
D．other passengers to arrive
单项选择题
The passengers were given a free meal because ______.
A．they arrived at the airport early
B．they hadn't had a meal yet
C．they had no money with them
D．the plane was delayed
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