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Not until all the fish died in the river ________ how serious the pollution was.

[  ]

A.did the villagers realize
B.the villagers realized
C.the villagers did realize
D.didn't the villagers realize

答案:A
解析:

这是一个倒装句,以not until开头的句子要用倒装结构,因为这个句子是一般过去时,所以在主语前要加did,谓语动词用原形。


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