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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单项选择题
Trade relationships between the two countries will improve if their ______ leaders could agree on the proposed quotas.
A．respectable
B．respective
C．respectful
D．respecting
单项选择题
He often ______ in his speech.
A. rumbles
B. stumbles C . tumbles
D. jumbles
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