Losing weight is no easy task. A lot of people who lost weight gain it back over time and

问题补充：

Losing weight is no easy task. A lot of people who lost weight gain it back over time and end up back they started.

A. where

B. though

C. since

D. after

答案：

(答案→)A. where

B. though

C. since

D. after

解析：考查地点状语从句。减肥不是一件容易的事，许多人减肥一段时间后又回到了他们开始的地方。