A、For several months. B、For seven years. C、For a year or two. D、For several years. D在对话开始时，女士为男士房子里的陈设感到惊讶，询问这样做了多长时间，男士回答说I fir

M: Welcome to my house!
W: Well, Mr. Robinson, I’ m greatly surprised with all the work you’ve done on your house. (19)How long have you been working on it?
M: (19)I first became engaged in Do-it-yourself work several years ago. You see, my son Paul is disabled since childhood. (21)He’s always in the wheelchair and(20)I just had to make some changes for him to the house.
W: Then, what sort of changes did you make?
M: First of all, some practical things to help Paul. Just imagine the problems a disabled person would have in your house. We need a large house with wide corridors so that Paul could move from one room to another as he like.
W: What else did you do?
M: By the time I’d altered everything for Paul, Do-it—yourself work had become a hobby of mine. I really enjoyed doing things with my own hands.
W: What are you working on now?
M: I’ve just finished the kitchen. (21)Now I’m building an extension so that Paul will have a large room on the ground floor where he can work.
W: I heard that you have got a prize of $10 000 in the Do-it-yourself Competition. How are you going to spend it?
M: (22)I’m hoping to start my oven business soon so that I can convert ordinary houses for disabled people. I think I’ve become an expert on the subject.