题目内容
Not tmtil 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
提示：
提示：
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not until 引导的状语从句用于句首时，主谓倒装. |
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