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
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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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