◎ 题干
He insisted that he      from heart trouble, but I didn't think so.  
[      ]
A. should suffer    
B. has suffered      
C. suffers        
D. was suffering
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“He insisted that hefrom heart trouble, but I didn't think so. [ ]A. should suffer B. has sufferedC. suffers D. was suffering…”主要考查了你对  【过去进行时】  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。