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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I have kept that portrait () I can see it every day, as it always reminds me of my university days in London.

A.which
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When a man commits a crime, he tries to avoid ()any clues to his identity.

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