单项选择题

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

A．That
B．Which
C．It
D．As
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单项选择题
I have kept that portrait ______ I can see it every day, as it always reminds me of my university days in London.
A．which
B．where
C．whether
D．when
单项选择题
When a man commits a crime, he tries to avoid ______ any clues to his identity.
A．leaving
B．to leave
C．have left
D．to be left
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