◎ 题干
At this moment the bell rang, ________ the end of class.    
[     ]
A. announced          
B. having announced   
C. announcing    
D. to announce
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“At this moment the bell rang, ________ the end of class.[ ]A. announced B. having announcedC. announcingD. to announce…”主要考查了你对  【现在分词】  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。