单项选择题

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

A．Who
B．Which
C．As
D．It
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单项选择题
I regret I haven't given you enough help.
A．saying
B．having said
C．to say
D．to have said
单项选择题
______ , he remained honest.
A．As poor as Paul was
B．Poor as Paul was
C．As Paul was poor
D．Since Paul was poor
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