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
The person who ______ this type of research deserves our praise.
A．originated
B．manufactured
C．generated
D．estimated
单项选择题
I remember ______ the door before I went to bed.
A．locking
B．to lock
C．to have locked
D．being locked
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