i had just received a letter from my sister.这是什么时态,这种时态一般怎么用

问题描述:

i had just received a letter from my sister.这是什么时态,这种时态一般怎么用

过去完成时态 表示过去的过去
说明上面这句话是过去的某个时间说的
而收到一封信是在说话之前 也就是过去的过去