单项选择题

It is obvious that UNESCO ______.

A．is a company in France
B．is a world organization in the U. N.
C．works mainly at fighting against illiteracy
D．had many experts whose level of attainment is far from literacy
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Tom is now working in London and is not ______ to driving on the left.
A．served
B．customed
C．accustomed
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单项选择题
______ the problems, the leaders should take the following points account.
A．When considered
B．While considering
C．Consider
D．Having been considering
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