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【题目】You'd better ______ when your mouth is full of food

A.don't speakB.not to speakC.not speakD.not speaking

【答案】C

【解析】

句意:当你满嘴食物时你最好不要说话。

结合句意:当你满嘴食物时你最好不要说话。You'd better not do sth表示“你最好不做某事”,固定句型,排除ABD。故选C

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