单项选择题

He often ______ in his speech.

A．rumbles
B．stumbles
C．tumbles
D．jumbles
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单项选择题
Helen was s6 persistent that her husband ______ at last.
A．conceded
B．converged
C．conceived
D．conferred
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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