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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单项选择题
A layman in this field______ this type of approach to improving work efficiency.
A．originated
B．speculated
C．generated
D．manufactured
单项选择题
I don't think he is that innocent, I think he did it______.
A．tiresomely
B．intentionally
C．incidentally
D．pertinently
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