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
All（）is needed is a continuous supply of the basic necessities of life.

A．what
B．that
C．it
D．which
单项选择题
It was the first time that he（）his composition in 30 minutes.

A．finished
B．finish
C．have finished
D．had finished
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