问题描述：
The police found that the house had been broken into and a lot of things ____
为什么是stolen 而不是 had been stolen
如果一定要用had been stolen 有严格的语法错误吗?
为什么是stolen 而不是 had been stolen
如果一定要用had been stolen 有严格的语法错误吗?
问题解答：
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