Question

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

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

Answer 1

【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A、B、D。故选C。