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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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
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
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