It was not until the sandstorms kept attacking north China that ______ how serio

游客2025-07-24 14

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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