题目内容
13．Mum always asks her son his dirty clothes everywhere．（ ）| A． | not leave | B． | doesn't leave | C． | not to leave | D． | don't leave |
分析 妈妈总是要她儿子不要到处乱扔脏衣服．
解答 答案：C．根据Mum always asks her son his dirty clothes everywhere，可知这里考查了ask的用法：ask sb to do sth要求某人做某事，否定句是ask sb not to do sth要求某人不要做某事，在to前面直接加not．故选C．
点评 本题考查了动词不定式的用法．熟知句意是解答本题的关键．
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