单项选择题

—You've booked on a two o'clock flight.—What chance ______ of taking a later plane

A．there is
B．it is
C．is there
D．is it
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单项选择题
The first stated aim of U. N. was______.
A．to watch and direct peace treaties
B．to revise international law
C．to prevent a third world war
D．to assist the developing countries
单项选择题
What time does the bus leave
A． At 9:20.
B． At 9:25.
C． At 9:30.
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