题目：
It’s very funny that many people who lose weight gain it back after some time and end up back __________ they started.
A．when
B．after
C．since
D．where
答案：
答案：D
题目分析：句意：很有趣的是在一段时间之后许多减肥的人又胖了回来，又回到了原点。首先，整个大句子是一个主语从句。it充当形式主语，句子还原后应为：Many people who lose weight gain it back after some time and end up back where they strated is very funny.
其次，句子的主干部分为Many people is funny. 其中用了一个who引导的定语从句修饰先行词many people表示 是怎么样的"许多人"。然后，end up back where they started 实际上是 end up (coming) back where they strated 是一个地点状语从句。这边的where是一个抽象意义的地方。故选D.
点评：状语从句也是高考的常考点，它可以修饰谓语、非谓语动词、定语、状语或整个句子。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。状语从句一般由连词(从属连词)引导，也可以由词组引起。
