◎ 题干
Only when we saw the photos about the air crash ________ how terrible it was.
[     ]
A. had we known  
B. we had known
C. did we know  
D. we knew
◎ 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“Only when we saw the photos about the air crash ________ how terrible it was. [ ]A. had we knownB. we had knownC. did we knowD. we knew…”主要考查了你对  【一般过去时】【部分倒装】  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。