单项选择题A.To have someone fix his computer.B.To train him how to take exams.C.To help him with his house-cleaning.D.To be his guide around the campus.
单项选择题A.The inventor decides who the expired patent goes to.B.The inventor may strive for a longer valid time span.C.The inventor will try hard to sell his products faster.D.The inventor will hesitate when giving his data to the public.