单项选择题

It is known to all ____ the Great Wall is one of the seven wonders.（　　

A.that
B.which
C.what
D.whoever
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Americans take pride in making the best use of their time. In the business world, time is _______ .
单项选择题
Lucy was about to go out ____ the telephone rang.（
A.after
B.before
C.until
D.when
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