The country's railway system has launched online ticket-booking and a real-name ticket purchasing system, and _______ requires passengers to provide their ID numbers when buying tickets.
#15729
A
which
B
that
C
what
D
this
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Is there __________with you? You don’t look well.
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A
wrong something
B
something wrong
C
wrong anything
D
anything wrong
He is not full . He wants to eat _____ piece of bread .
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other
B
others
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the other
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 _____ is the population of your country?
#16513
A
How
B
what
C
How many
D
How many