单项选择题

He got a job with the corporation in 1991 and has worked there ______.

A．since
B．ever since
C．ever before
D．till then
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单项选择题
______, he is not a very bright pupil.
A．As far as his intelligence is concerned
B．As far his intelligence is concerned
C．So his intelligence is concerned
D．As far as his intelligence are concerned
单项选择题
It is known to every one that the film is ______ a real event.
A．based on
B．built on
C．looked on
D．carried on
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