单项选择题

"I'm very tired.""We really should stop ______ and go to bed."

A．to study
B．studying
C．of studying
D．from studying
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单项选择题
I like black coffee very much. The stronger it is,
A．I like it better
B．the more I like
C．the better I like it
D．I like it more
单项选择题
It is known to the world ______ Mark Twain is a great American writer.
A．this
B．which
C．that
D．it
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