题干
30．1 tried to fix the car myself but ______ the attempt after a couple of hours．
A：gave i
B：gave off
C：gave u
D：gave away
答案(点此获取答案解析）
C
A：gave i
B：gave off
C：gave u
D：gave away
满足
，
，则此数列的通项
等于（ ）
