it's a nice day (C.for) a walk.表示理由或原因,意为“因为、由于”.如:Thank you for helping me with my English.谢谢你帮我学习英语.Thank you for your last letter.谢谢你上次的来信.Thank you for teaching u...额，再问一个。Why （）learn English。A.don't B.notC.not youB.not