个人观点：“你喜欢折纸飞机多久了?”,所以选C doing.A making不恰当,本疑问句是针对折纸飞机这个动作进行提问,所以是do的某种形态；而如果选择A making的话,是说我喜欢折纸飞机,而且暗示从我喜欢折纸飞机的一刹那开始就“一直在折纸飞机”,显然不恰当.
I like making paper planes How long have you been ____that?
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