He has sent request for spare part.

He has asked for spare part. he has sent requests for spare parts.he has __spare parts. He has sent a great many requests for spare parts .其中FOR在这里代 英语翻译request for spare parts和request of spare parts Mr.Scott has sent a great many requests for spare parts Mr.Scott has sent a great many requests for spare parts and Mr.Scott has sent a great many requests for spare parts 里的fo she has sent many requests for spare parts.能不能改成 .requests o he has already sent for和he has already been sent for 有区别么,后一 Your service request has been sent to us. 怎么改反意疑问句he seldom has spare time for hobbies,____? component spare part