单项选择题

______, the old professor is still trying to learn a foreign language.

A．However he is old
B．Old as he is
C．He is so old
D．As is he old
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单项选择题
All ______ is needed is a continuous supply of the basic necessities of life.
A．what
B．that
C．it
D．which
单项选择题
Mrs. Brown is supposed ______ for Italy last week.
A．to have left
B．to be leaving
C．to leave
D．to have been left
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