Question

I ________ the watch that I ________ the other day.

1. A.
   had lost, had bought
2. B.
   lost, had bought
3. C.
   had lost, bought
4. D.
   lost, bought

Answer 1

B
解析：that引导的是一个定语从句。根据句意，“买”在先，所以用过去完成时(过去的过去)；“丢失”在后，用一般过去时。
方法提炼：表示过去几个连续的动作：①当甲动作发生之后，才发生乙动作，那么甲动作用过去完成时，乙动作用一般过去时。如：The train had gone before we reached the station. ②当句中有before，after等连词时，因为可以明显区分两件事情发生的先后，所以两者皆可用“一般过去时”。如：After you went(had gone)，I went to sleep. ③过去一连串动作，如用and连接，常用一般过去时．如：My uncle bought a coat in Sydney and sent it to me.