单项选择题

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

A．That
B．Which
C．As
D．It
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单项选择题
Influenced by his teacher, he decided to take politics as his ______.
A．job
B．task
C．work
D．career
单项选择题
You will make a(n) ______ by selling it now; if you wait, the price may fall.
A．profit
B．interest
C．expense
D．loan
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