单项选择题
Work hard, ______ you will fail in the exam.
A．although
B．and
C．or
D．unless
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单项选择题
I think you have paid ______ your health.
A．too few attention to
B．too little attention to
C．too little attention for
D．too a few attention to
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单项选择题
Not once ______ his view of life.
A．did the gentleman mention
B．the gentleman mentioned that
C．the gentleman mentioned
D．do the gentleman mention
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