Question

【题目】We ____ out by that time that he ____ a spy for a long time.

A. had found…had been B. had found…was

C. found…had been D. found…was

Answer 1

【答案】A

【解析】句意：那时我们发现他已经做了很长时间的间谍了。根据时间状语by that time可知，第一个空是过去完成时，其结构是had done的形式。根据时间状语for a long time可知用过去完成时，根据题意，故选A。