【題目】It is not until all the fish died in the river ________how serious the pollution was.
A.did the villagers realize
B.that the villagers realized
C.the villagers did realize
D.didn't the villagers realize

【答案】B
【解析】句意：直到河里的魚都死光了,村民們才意識到污染是多么嚴重。此處是It is not until ...that...，的強調(diào)句型，所以答案是B。

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