Why not________on the heater since it's so cold here？A.you turnB.to turnC.turningD.turn
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D解析分析：提出“建议”的句型why not意思是“干吗不”，why not后面的动词用不带to的动词不定式形式。(延伸)Why not do sth？是“建议”句型，因此不能用because来作反应。应该说That's a good idea．对过去的事情是不可能发出“建议”的。下面是错句：Why not turn on the heater yesterday？应该改为Why didn't you turn on the heater yesterday？此时要用because来回答问题。(延伸)Why not do sth？(对双方或对对方发出建议)来源于Why don't we do sth？(对双方发出建议)或Why don't you do sth？(对对方发出建议)