题目内容
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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