单项选择题

______ is known to the world, Mark Twain is a great American writer.

A．That
B．Which
C．As
D．It
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单项选择题
A．have writtenB．to be writtenC．are writtenD．write
A．have written
B．to be written
C．are written
D．write
单项选择题
A．thingsB．wayC．pagesD．language
A．things
B．way
C．pages
D．language
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