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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单项选择题

When he just got off the plane, he gave us a good description of（）he had seen in Spain.

A．what
B．that
C．which
D．how

单项选择题

（）that bad weather was on the way, the climbers decided to put off their attempt on the Alps until the following week.

A．Having told
B．Being told
C．Telling
D．Having been told

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