past perfect
短语n. （动词的）过去完成时
释义与例句
n.
-
1.
A tense which describes actions that occurred before another action or event in the past; the pluperfect or the past anterior tense.
不可数
n. （动词的）过去完成时
A tense which describes actions that occurred before another action or event in the past; the pluperfect or the past anterior tense.