---You should have bought me a camera rather than an MP4 for my birthday.---I'm sorry, Helen. I didn't know you ________.A.have got itB.had got itC.hadn't got oneD.haven't got one
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C解析句意：--我过生日时你本该给我买一部相机而不是MP4。--对不起，海伦，（买的时候）我不知道你没有相机呀。根据句意，可知海伦没有相机这一事实是在I didn't know之前。故用过去完成时，所以选C。