it was clear that he had given us the wrong telephone number

题目

it was clear that he had given us the wrong telephone number
A.gives.
B.had given
为什么要用had呢,最多也是要用have啊,感觉好奇怪啊

答案

it was clear that he had given us the wrong telephone number
因为这边主句的时态是一般过去时,从句原本的时态是一般过去时,受主句的影响,时态往前推一个,变成了过去完成时