单项选择题

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

A. That
B. Which
C. It
D. As

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They're satisfied with the replies they've received from the public（）far.

A. that
B. so
C. for
D. as
单项选择题
Why don't you take physics next semester It's not（）to understand as you might think.

A. that hard
B. too hard
C. so hard
D. such hard
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