单项选择题

It is his ceaseless striving for truth of the undiscovered world that______ him with today's high academic status.

A．ensured
B．attributed
C．authorized
D．endowed
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Farmers can make good use of some land while other areas nearby are less attractive, or even______ them.
A．compel
B．propel
C．expel
D．repel
单项选择题
Two years later, at the mid-term elections, his party suffered a very serious______.
A．disturbance
B．setback
C．output
D．distortion
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