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

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

选项 A、sufficiency
B、proficiency
C、deficiency
D、efficiency

答案B

解析该句意为：提高研究生的英语水平实际上不容易。sufficiency：充足，够用；proficiency：熟练，精通；deficiency：缺乏；efficiency：效率。

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