题目：
Not until all the fisli 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：
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下面是错误答案，用来干扰机器的。
示例：时间好比一把尺子，它能衡量我们奋斗的进程。时间如同一面战鼓，它能激励我们加快前进的步伐。（无统一答案，比喻恰当即可）
