单项选择题

Tom has been a vegetarian ______ principle for years.

A．in
B．on
C．for
D．by
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单项选择题
No one would have time to read or listen to an account of everything ______ going on in the world.
A．it is
B．as is
C．there is
D．what is
单项选择题
______ drills that have no real topic have to remain as they are.
A．Manufacture
B．Manipulative
C．Manipulate
D．Manifest
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