单项选择题

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

A．That
B．It
C．Which
D．As
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Mary was picked from thousands of applicants for a teaching job.
A．up
B．off
C．out
D．in
单项选择题
Only after I mailed the letter that I had forgot to put a stamp on it.
A．I remembered
B．did I remember
C．I didn't remember
D．didn't I remember
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