单选题 Dear Mr. Jefferson, I beg to report that I shall be absent from school from the 12th to 17th inst. (本月的) in order to return home to see my grandfather, who has been suffering from cancer since last year and is now in critical condition. I would be very much obliged (感激的) if you would grant me my leave. As for the lessons to be missed during my absence, I will do my best to make up for them as soon as I come back.