资料题："He has not forgotten one of Mark's seventeen birthdays" means（　）。

Some people do not like anything to be out of place; they are never late for work; they return their books to the library on time; they remember people's birthdays; and they pay their bills as soon as they arrive.Mr.Dodds is such a person.Mr.Dodds wors in a bank, and lives on his own.The only family he has is in the next town,his sister lives there with her husband, and her son, Mark.Mr.Dodds seldom see his sister, or her family, from one year to the next, but he sends them Christmas cards, and he has not forgotten one of Mark's seventeen birthdays.Last week Mr.Dodds had quite a surprise.He drove home from the bank at the usual time, driving neither too slowly nor too fast; be parked his car where he always parked it, out the way of other cars, and he went inside to make his evening meal.Straight away, there was a knock at the door.Mr.Dodds opened the door to find a policeman standing on the doorstep.“What have I done wrong?" Mr.Dodds asked himself, "Have I driven on the wrong side of the road? Has there been some trouble at the bank? Have I forgotten to pay an important bill?"“Hello,”said the policeman,“My name's Mark.”