单项选择题

Since he left the University, he __________ in an accounting company.

A．has been working
B．had worked
C．had been working
D．was working
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单项选择题
__________ full preparation, you won’t have much chance of success.
A．After
B．Before
C．With
D．Without
单项选择题
It is no __________ talking to him because he will never change his mind.
A．help
B．use
C．time
D．Way
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