题目内容
【题目】—buy a present for mum online?
— Good idea.
A.Why not to
B.Why don't
C.Why not
D.How about
【答案】C
【解析】句意:……在网上给妈妈买礼物?-好主意,根据回答Good idea. 可知此处是提出一个建议。why not+动词原形,排除A,why don't you……B选项少了you,排除,how about+动词ing,排除,因此用Why not为什么不,故选C.
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