单项选择题

When traveling in a foreign country, one should be careful to carry ______ at all times.

A．their passports
B．your passport
C．his passport
D．her passport
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单项选择题
He likes______classical music on the piano.
A．only to play
B．to only play
C．only to playing
D．to play only
单项选择题
______the Queen's arrival, the crowd rose to its feet.
A．On
B．At
C．In
D．For
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