单项选择题

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

A．However he is old
B．Old as he is
C．He is as old
D．As old is he
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单项选择题
Our department has a large collection of books, ______ are in English.
A．many of which
B．many of them
C．many ones
D．their many
单项选择题
To learn Chinese cooking, you should practice ______.
A．so much you can
B．so much as you can
C．much as you can
D．as much as you can
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