After they had arrived campus a girl was sssigned to take them on a tour of the halls这个地方为什么要用 过去 完成时

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After they had arrived campus a girl was sssigned to take them on a tour of the halls这个地方为什么要用 过去 完成时
After they had arrived campus a girl was sssigned to take them on a tour of the halls
这个地方为什么要用 过去 完成时

After they had arrived campus a girl was sssigned to take them on a tour of the halls这个地方为什么要用 过去 完成时
因为这个动作是发生在girl was sssigned to take them on a tour of the halls之前的.
因为girl的动作用的是过去时,过去的过去就用过去完成时.
我们老师教我们,看这个动作和主语发生的动作有没有时间差、如果有时间差,一般就用完成时.
比如说:主语的动作是一般现在是,那么该动作如果有时间差就用现在完成时.