单项选择题

Professor Black had us（）compositions every Friday.

A．to write
B．written
C．write
D．wrote

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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
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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