单项选择题

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

A．As
B．Which
C．That
D．Who
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单项选择题
Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.
A．for that
B．at that
C．with that
D．in that
单项选择题
With the introduction of the computer, libraries today are quite different from ______ they were in the past.
A．that
B．what
C．which
D．those
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