单项选择题

Improving the English ______ of graduate students is actually a demanding undertaking.

A．sufficiency
B．proficiency
C．deficiency
D．efficiency
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单项选择题
Only when you have accumulated enough credits will you be ______ to apply for the degree.
A．elementary
B．ethnic
C．eligible
D．elegant
单项选择题
The descendants of prominent families have to learn to protect their privacy in one way or another.
A．eminent
B．affluent
C．thrifty
D．considerable
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