Iwasjust<spanstyle="text-decoration:underline;">fallingsleep</span>lastnight<spanstyle="text-decoration:underline;">when</span>Iheard<spanstyle="text-decoration:underline;">aknock</span><spanstyle="text-decoration:underline;">atthedoor</span>. A: fallingsleep B: when C: aknock D: atthedoor