Have you ever been ________ when you are chatting happily with your close friend when your mobile phone battery runs out in the middle of a call?
A.upsettingB.upsetC.disturbedD.disturbing在线课程B
句意：当你正与好友愉快地聊天，突然手机没电了，这时候你曾经心烦过吗？upset在此句中作形容词用，意为“苦恼的；心烦的”；disturbed意为“扰乱的”。