I____along to see you when I ran into a friend of mine and was asked to dinner.A.cameD.is comingC.was comingB.had come

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• I____along to see you when I ran into a friend of mine and was asked to dinner.A.cameD.is comingC.was comingB.had come
• I____along to see you when I ran into a friend of mine and was asked to dinner.
• wo我,拼音怎拼用语音,
• 一个关于周期函数的疑问函数f（x）满足f（px）=f（px-p/2)(x∈R,P为大于0的常数）,则f（x）的最小正周期为p/2,我想问的是函数f（px-p/2)可以看成是函数f（px）向右移了1/2个单位,那为什么函数f（x）的最小正周期不是1/2,请高人指教,