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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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问答题
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
单项选择题
能否将二维气水两相数学模型守恒方程推导时流出与流出的密度和孔隙度等不要角标?()
A．能
B．不能
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