单项选择题

It is about time that such practices

A．are ended.
B．be ended.
C．were ended.
D．must be ended.
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Margie's bedroom was in a ______ , with books and papers covering every possible surface.
A．litter
B．disorder
C．rubbish
D．mess
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The World Trade Center, the top ______ was 410 meters high, was the tallest building in the world.
A．which
B．of which
C．of whose
D．that
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