◎ 题干
When the mother heard a bomb exploded _____ his son was working, her heart _______, wondering if
her son was safe.     
[     ]
A. where; sank  
B. in which ; broke  
C. that; was broken    
D. at which; sank
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“When the mother heard a bomb exploded _____ his son was working, her heart _______, wondering if her son was safe. [ ]A. where; sank B. in which ; brokeC.t…”主要考查了你对  【动词】【状语从句】  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。