选第2 个.not only.but also 用于连接两个表示并列关系的成分,not only 位于句首要半倒装,正常语序是：Not only the car has been sold by his son for gambling debts but also his new house.
其中 the car 和his new house 是并列成分.这就是第一个空的has.
后面 the car（ he has ）做后置定语,修饰 the car.
加油加油!没错，是选2。不过the car（ he has ）做后置定语，为什么不是the car（ he had ）