单项选择题

She may come with us ______ that she arrives in time.

A. in case
B. unless
C. if
D. provided
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______ is known to the world, Mark Twain is a great American writer.
A. Who
B. Which
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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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