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 查看更多

 

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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

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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

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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

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 Only when we saw the photos about the air crash ______ how terrible it was.

A.      we knew      B .we had known   C. did we know    D. had we known

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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

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