It was not until the sandstorms kept attacking north China that ______ how serious the problem was.

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问题 It was not until the sandstorms kept attacking north China that ______ how serious the problem was.

选项 A、did the people realize
B、didn’t the people realize
C、the people realized
D、the people did realize

答案C

解析 这是强调句,强调not unitl引导的时间状语,that后应接主语+谓语的正常语序,所以排除A、B。既然已用到强调句型就不必再用助动词did来表示强调,所以D也不能选,答案为C。
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