Have you down _____ to improve your English?A something useful B anything usefulC nothing useful D useful anything

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Have you down _____ to improve your English?
A something useful B anything useful
C nothing useful D useful anything

选择B;
something 用于肯定
anything 用于疑问和否定;然后有用的东西一般表达为something useful,疑问句中将something改为anything即可.