这是惯用法,没什么道理可讲的,记住就是
put off （=delay 后接 名词 代词 动名词）
延期
They decided to put the meeting off until after Christmas.
他们决定把会议推迟到圣诞节以后.
Owing to the state of the ground,the match has been put off.
由于场地状况不佳,比赛推迟了.
The appointment was put off because of his illness.
由于他生病而推迟了约会.
If you think you are sick you should not put off going to the doctor.
如果你觉得有病就不应该拖,要快去看医生.
请及时采纳,不懂继续问( 天天在线 ）