单项选择题

There is no specific rule ______ what we should wear to a dinner party.()

A. because of
B. as to
C. as of
D. but for

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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

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

A. since
B. ever since
C. ever before
D. till then