◎ 题干
The boy fell asleep ________doing his homework.
[     ]
A. when          
B. as          
C. while          
D. since
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“The boy fell asleep ________doing his homework.[ ]A. whenB. as C. while D. since…”主要考查了你对  【并列连词】  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。