单项选择题

Helen was s6 persistent that her husband ______ at last.

A．conceded
B．converged
C．conceived
D．conferred
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单项选择题
A full ______ of all the reasons for and against closing the railway has begun.
A．explosion
B．exploration
C．exploitation
D．explanation
单项选择题
The company's training plan was designed to help the employees to improve their work habits and ______.
A．proficiency
B．sufficiency
C．insufficiency
D．efficiency
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