You'd better when your mouth is full of food．( )A．don't speakB．not to speakC．not speakD．not speaking 题目和参考答案——青夏教育精英家教网—

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17．You'd better ______ when your mouth is full of food．（　　）

A．

don't speak

B．

not to speak

C．

not speak

D．

not speaking

分析当你满嘴食物时你最好不要说话．

解答答案：C．根据题干，本句的意思是当你满嘴食物时你最好不要说话．根据'd better （not） do sth表示"最好（不）做某事"，是固定结构，故选C．

点评本题考查否定句，做题时应熟练掌握'd better （not） do sth的用法．

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