单项选择题

He is quite worn out from years of hard work. He is not the man ______ he was 20 years ago.

A．which
B．that
C．who
D．whom
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Water is a good ______ for transmitting sound.
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C．median
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I think you can take a(n) ______ language course to improve your English.
A．intermediate
B．middle
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