____
— Did you enjoy____ (you) at the concert?
— Yes, I enjoyed ____ (listen) to music all the time.
某烃类化合物A的质谱图表明其相对分子质量为84，红外光谱表明分子中含有碳碳双键，核磁共振谱表明分子内所有氢原子都处于相同的化学环境，由此推测
