单项选择题

When a man commits a crime, he tries to avoid ______ any clues to his identity.

A．leaving
B．to leave
C．have left
D．to be left
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单项选择题
It's a pity that Professor Smith has failed to make his idea ______ in the classroom.
A．understanding
B．to be understood
C．understood
D．to understand
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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