◎ 题干
The work of professional sectaries is so ______  that few people like to apply for it; it demands of not      only high working efficiency bust also ______  available all the time. As a result, they are ______ great    demand.     
[     ]
A. demanding; being; in  
B. demanded; being; in  
C. demanding; be; in  
D. tiring; being; of
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The work of professional sectaries is so ______ that few people like to apply for it; it demands of not only high working efficiency bust also ______ available …”主要考查了你对  【形容词】【介词和介词短语】【动名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。