单项选择题

To succeed in a scientific research project, （）.

A．persistence is what one needs
B．persistence is needed
C．one needs be persistent
D．one needs to be persistent

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单项选择题
Corruption in government was exposed through the agency of the press.（）

A．Dishonesty
B．Virtue
C．Prejudice
D．Diligence
单项选择题
If you stand there you obscure our view of the race.（）

A．restrain
B．enclose
C．shade
D．spoil
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