单项选择题


A．classified
B．recognized
C．categorized
D．distinguished
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单项选择题
A．added toB．added up toC．adding toD．adding up to
A．added to
B．added up to
C．adding to
D．adding up to
单项选择题
The author seems to be wondering _________.
A．what makes up one's adequate working knowledge of English
B．why English can serve so many needs of various people
C．how to relate the technological problems in airport communication,.
D．when English became so widely used
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