单项选择题

His effort of decades began to ______ He came to be well-known for his findings.

A．pay off
B．die off
C．put off
D．break off
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单项选择题
This great project at the Three Gorges of the Yangtze is expected to ______ twenty years to complete.
A．spend
B．consume
C．need
D．take
单项选择题
When a man knows that he will be put into prison if he uses a potentially deadly object to rob or do harm to another person, he will think twice about it.
A．passive
B．lifelong
C．unhappy
D．fatal
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