单项选择题

We regret ______ you that the materials you ordered are out of stock.

A．informing
B．to inform
C．having informed
D．to have informed
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单项选择题
The old lady cannot ______ herself ______ the idea that somebody is following her all the time.
A．free ... with
B．free ...of
C．free ... out
D．free ... away
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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