问答题 情景：
你是小明。由于昨天不慎得了感冒，所以今天不能来听课。
任务：
请你给老师写一张50词左右的便条，告诉他：
·不能来上课的原因。
·表示歉意。
·希望病好以后就来上课。
请用下面格式。
Dear Sir,
...
Xiao Ming
【正确答案】
【答案解析】[范文]
Dear Sir,

Please excuse my absence from class today because I got a bad cold yesterday evening and failed to sleep well at night. I felt even worse this morning. Therefore, I’had to go to the doctor to have myself thoroughly examined. Thus, I am writing to ask you for a day’s sick leave and assure you that I’11 resume my study if I feel any better tomorrow.
Sincerely,
Xiao Ming