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
______ to help was a great encouragement to us.
A. Their coming
B. Them coming
C. They coming
D. They come
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