单项选择题

You must let your manager understand the details of the feasibility study ______ by 5 o'clock this afternoon.

A．without fail
B．without trouble
C．without failure
D．without difficulty
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单项选择题
Thomas would have been more successful if he had studied harder, ______.
A．didn't he
B．wouldn't he
C．hadn't he
D．hasn't he
单项选择题
It is better to die on one's feet than ______.
A．live on one's knees
B．to live on one's knees
C．live at one's knees
D．to live at one's knees
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