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

According to the passage, a large population will provide a chance for developing_________.

A．agriculture
B．transport system
C．industry
D．national economy

单项选择题

Today books are________ to everyone because they are no longer expensive.

A．available
B．preferable
C．reliable
D．actual

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