I’m calling about the apartment you __the other day. Could you tell me more about it?

A．advertised

B．had advertised

C．are advertising

D．will advertise

（3分）某烃经李比希元素分析实验测得碳的质量分数为85.71%，氢的质量分数为14.29%。该烃的质谱图显示：其相对分子质量为70，该烃的核磁共振氢谱如下图所示，请通过计算确定该烃的实验式、分子式、结构简式。